Abstract
Tourism-induced Dutch disease can be particularly detrimental to small open economies due to deindustrialization and potential long-term welfare loss. This study adopts an innovative macroeconomic modelling tool, dynamic stochastic general equilibrium modelling, to investigate the effects of external inbound tourism booms on the national economic account of a small open economy. The results confirm the existence of Dutch disease, but tourism booms also bring welfare gains to the destination country. We further model the effects of two strategies to mitigate the Dutch disease by assuming that the government can tax the tourism sector and subsidize the manufacturing sector in two ways: production subsidies and investment subsidies. The results show that the effectiveness of production subsidies is very modest, while investment subsidies can almost completely overturn the Dutch disease. In terms of welfare, investment subsidies lower welfare gains in the very short term, but the positive effects persist over the longer term, which is different from the production subsidy case. Last, practical implications are provided.
Introduction
Along with the fast growth of the tourism and travel industry globally, the significant economic contribution of tourism to the local community and destination country has been largely recognized and applauded (Pablo-Romero and Molina, 2013). The tourism industry is touted as the most important earner of foreign exchange in many countries and regions (Balaguer and Cantavella Jordá, 2002). Tourism growth tends to create job opportunities, increase public and private investments in local infrastructures and extend the openness of foreign investment to various sectors (Lin et al., 2019), all of which are likely to contribute to the local economic prosperity. The development of tourism relies heavily on endowments of tourism resources as tourist attractions, and this provides valuable opportunities for many less developed regions with rich natural/cultural tourism resources to develop their tourism industries (Yang and Fik, 2014).
Despite the considerable economic contributions that tourism brings in, many negative consequences of tourism growth have been highlighted. In addition to the assorted negative impacts from social, cultural, environmental and ecological perspectives (Gössling and Peeters, 2015; Lee, 2016), some negative economic consequences were also recognized. For example, Lanza et al. (2003) suggest that an overdependence on tourism can impede long-term economic growth. In particular, the phenomenon of the Dutch disease regarding deindustrialization may be induced by a tourism boom (Chao et al., 2006), and the decline of the capital stock may cause a welfare loss in the long run (Nowak and Sahli, 2007).
Various types of macroeconomic models have been introduced to understand the impact of tourism on the local economy. Econometric models (e.g. the vector autoregression and dynamic panel data model) have been prevalent to understand the short- and long-term relationships between tourism expansion and economic growth (Iglesias et al., 2018), and the input-output (I-O) and computable general equilibrium (CGE) models have frequently been used to understand how an economy reacts to changes in tourism income and revenues (Meng and Pham, 2017). However, the dynamic stochastic general equilibrium (DSGE) model, which is a cutting-edge macroeconomic model, has not been applied to tourism economics so far. 1 Unlike the econometric analysis of data, a DSGE model provides a theoretical and structural empirical account of macroeconomic relationships; it is micro-founded, immune to Lucas critique (Lucas, 1976), enclosing agents’ intertemporal optimization under uncertain environments into the model. Unlike other static macroeconomic analysis tools such as I-O and CGE models, the DSGE model takes dynamic factors and stochastic terms into consideration under the general equilibrium theory (Hashimzade and Thornton, 2013). All the above features are absent in most I-O and CGE frameworks. While previous types of analysis are of decent benefits, more sophisticated techniques that are better able to represent a real economy, are available, and we take advantage of the advances in macroeconomic modelling by incorporating DSGE type of framework into tourism economics analysis.
While there is much literature on the economic impacts of tourism (Song et al., 2012), these issues have rarely been examined in a DSGE framework, which has been very popular in mainstream macroeconomics (Wickens, 2014). To fill the research gap, we propose a DSGE model to investigate the impacts of an external tourism boom on a small open economy with two sectors: tourism and manufacturing. The small open economy is calibrated based on the macro data of Thailand, a Southeast Asian economy that heavily depends on the tourism industry (Wattanakuljarus and Coxhead, 2008). The reasons why we pick up Thailand are threefold. First, the export of tourism services is a major driver of the Thai economy. The value of tourism services reached 50 billion US dollars in 2016, accounting for 12.5% of national gross domestic product (GDP; Bank of Thailand, 2016). Second, the Asia-Pacific region is the second most visited region in the world after Europe and has been the fastest growth in recent years (UNWTO/GTERC, 2017). Third, the rate of growth of Thailand’s share of inbound tourists to the Asia-Pacific region is increasing recently, which is companied by faster growth in the tourism sector than the regional and global average (Bank of Thailand, 2016).
Our postulated hypotheses are as follows: (1) the inbound tourism demand shock would cause Dutch disease, (2) the induced Dutch disease would lead to welfare loss and (3) governmental policy can help alleviate the tourism-induced Dutch disease. In particular, we are interested in the occurrence of tourism-induced Dutch disease and how to alleviate the Dutch disease with government tax and subsidy policies. By looking into the dynamics of the effects, we are able to see the dynamic trajectories of how the inbound tourism demand impacts the two sectors of the domestic economy and how governmental tax and subsidy policies counteract the Dutch disease effects. Therefore, this study contributes to the current knowledge of the Dutch disease in at least two major ways. First and foremost, our study represents one of the pioneering research efforts applying DSGE to tourism economics (Su, 2017). Using a DSGE model, we are able to capture the dynamics of the structural relationship among different variables and understand how Dutch disease takes place from inbound tourism shock via various channels. Second, we propose potential prescriptions for treating Dutch disease from a rigorous quantitative perspective instead of qualitative measure mainly considered in the literature, and the effectiveness of production subsidies and investment subsidies in the manufacturing sector is tested and compared under the DSGE framework to highlight the policy trade-off between the two subsidies.
The main results of our study can be summarized as follows. Our analysis confirms the existence of Dutch disease, but tourism booms also bring welfare gains to the destination country. In terms of prescription of Dutch disease, we compare the effectiveness of production subsidies and investment subsidies. The results show that the efficacy of production subsidies is very modest, while investment subsidies can almost completely overturn the Dutch disease. Regarding welfare, investment subsidies lower welfare gains in the very short term, but the positive effects persist over the longer term, which is different from the production subsidy case. The rest of this article is structured as follows. The second section briefly reviews the literature. The third section constructs the small open economy DSGE model for our analysis. The fourth section calibrates the parameter values and provides the empirical results. Concluding remarks are given in the last section.
Literature review
In recent years, there has been a growing interest in academics, international policy institutions and central banks in developing small-to-medium, even large-scale, open economy macroeconomic models called a DSGE framework (Fernández Villaverde et al., 2016). The term ‘DSGE’ was initially introduced by Kydland and Prescott (1982) in their seminal contribution on the real business cycle (RBC) model, which is based on a neoclassical framework with micro-founded optimization behaviour of economic agents with flexible prices. Soon the model was extended into small open economies to account for the stylized facts observed in typical candidate countries (Mendoza, 1991). The use of DSGE models used to be criticized due to their inability to fit the data (Pagan, 2003), but the new generation of DSGE models developed by Christiano et al. (2005) among others has shown great promise of improving the empirical fit in both the closed economy (Smets and Wouters, 2004) and open economy (Adolfson et al., 2007) scenarios. Although DSGE models have become popular for studying macroeconomic fluctuations and analysing quantitative policy issues, the application of DSGE models in the tourism field is still profoundly underdeveloped (Liu et al., 2018).
Turning to the tourism issue, for a tourism-oriented economy, an expansion in tourism sector is naturally welcomed because more visitors can bring more income to the local economy (Hazari and A-Ng, 1993). International tourism is considered as a major source of foreign exchange and an important engine of local economic growth (Hazari and Sgro, 1995). The positive effect of tourism on long-run economic growth can work through several channels. First, the foreign exchange earned from inbound tourists can be used to pay for imported capital or basic inputs used in the production process (Nowak et al., 2007). Second, tourism plays an important role in spurring local investment in new infrastructure like transportation facilities (Chou, 2013). Third, tourism contributes to generate employment and to increase income for relatively unskilled labour (Inchausti Sintes, 2015). Fourth, tourism is an important factor of diffusion of technical knowledge, simulation of research and development and accumulation of human capital (Sihabutr, 2012). Based on these, tourism is believed to bring positive impact to local economy, and tourism policies are becoming major concerns for many countries.
Apart from the positive economic effects, the influx of foreign tourists tends to also generate undesirable consequences to residents of the host country, such as congestion in the tourism related consumption and infrastructure and the degradation of environmental quality (Chang et al., 2011). Additionally, a tourism boom tends to boost the demand for these non-traded goods and thus moves the productive factors away from the traded (manufacturing) sector to the non-traded sector. An expansion in the non-traded sector is coupled with a contraction in the traded sector, thereby leading to the emergence of the Dutch disease (Copeland, 1991). Dutch disease is traditionally related to the effects of an expansion of a booming sector on the rest of the economy, where the main concern is with the possibility of deindustrialization (Corden and Neary, 1982). In the tourism context, one major factor contributing to the Dutch disease is the price effect from the tourism boom; selective studies of tourism-related Dutch disease among others are summarized in Table 1. Chao et al. (2006) show that an expansion of tourism increases the relative price of non-traded goods, which leads to a gain in income via the secondary terms of the trade effect. This price effect results in a decrease in the demand for capital and therefore a reduction in output by the traded good sector. Additionally, Nowak and Sahli (2007) demonstrated that the tourism-induced Dutch disease partly results from labour losses and intense tourism-related land use.
Brief summary of previous studies of tourism-induced Dutch disease.
Note: SGE: static general equilibrium; DGE: dynamic general equilibrium; CGE: computable general equilibrium.
Several studies have empirically or mathematically confirmed the tourism-induced Dutch disease (Capó et al., 2007; Forsyth et al., 2014; Inchausti Sintes, 2015; Pham et al., 2015), albeit with some exceptions (Holzner, 2011). Copeland (1991) used a static trade model to study how a tourism boom would affect the welfare and pattern of production in the destination country and concluded that the Dutch disease will occur, whereas welfare is improving when there is no distortion. Chao et al. (2006) constructed a specific-factor model and found that a tourism boom leads to deindustrialization improved welfare when there is no capital externality for manufacturing production. Chang et al. (2011) further developed a dynamic optimizing macroeconomic model with touristic congestion externalities and found deindustrialization in the manufacturing sector led by tourism expansion. In another study, Chen et al. (2016) considered a general two-sector model in which a tourism good also needs capital to be produced and indicated that the Dutch disease occurs after tourism expansion but welfare will be affected only when there is an imperfect international financial market in which the destination country cannot borrow freely.
A handful of studies have discussed the possible ways to treat the Dutch disease. In their discussion of the general tourism taxation policies, Sheng and Tsui (2009) and Sheng (2017) suggested that taxing tourism can be a viable way to alleviate the symptoms of the Dutch disease. In another study, Sheng (2011) specifically investigated the policies to combat the Dutch disease. Using a general and partial equilibrium analysis, they demonstrated that a combination policy using taxes and subsidies is not appropriate due to the adverse effects on local welfare. More recently, Su (2017) confirmed that a tourist subsidy that is financed by government debt has a small effect on helping the tourism industry. By and large, the above studies related to Dutch disease in tourism and its cure are mainly using qualitative tools (focusing on the direction of change in some variables as related to change of some other variables), ignoring the quantitative aspects of the problem, which provide valuable information for policy implementation. The DSGE framework with calibrated parameter values has been well-recognized for its merits in quantitative analysis, and we can also enclose uncertainties (as stochastic terms) in a dynamic context to match more closely to the reality, on the ground of treating Dutch disease in tourism perspective in a more advanced economic modelling environment.
DSGE model of Dutch disease
Following the convention in the tourism economics literature (Chao et al., 2006; Copeland, 1991; Su, 2017), we consider a small open economy with two types of final goods: a tourism good
In our model, we assume that there are five groups of decision-makers in the national economy: domestic households, foreign tourists, tourism firms (in the tourism sector), manufacturing firms (in the manufacturing sector) and a government. Domestic households derive utility from consumption and leisure (and disutility from working). Subject to their budgetary constraints, the households seek to maximize their lifetime utility, defined as the present value of current and future instantaneous utility that would be stated shortly after. They consume both types of goods, tourism goods

Circular flow of the economy. Note: Solid arrows mean definite flows, whereas dashed ones capture either cases (government transfers to households or subsidizes manufacturing firms).
Household
The economy is inhabited by a unit measure of identical and infinitely lived domestic households, which derive utility from consumption and disutility from working (Shen et al., 2018). The disutility of working is the reverse of the utility of leisure. The household’s lifetime utility function is given by
where
where
where
The households face the following intertemporal budget constraint
where wt
is the composite wage index.
4
Foreign tourists
In line with previous literature on tourism (e.g. Chang et al., 2011; Chao et al., 2006; Chen et al., 2016), we assume that besides the domestic consumers, there are also foreign tourists in the economy. By assumption, they do not work or invest but only demand the tourism goods and pay consumption taxes to the government of the destination country. The demand of foreign tourists
where
where
Firms
The setting of the production environment largely follows the literature (Chen et al., 2016). Both the tourism and manufacturing sectors are assumed to be perfectly competitive for simplicity. 5 Aggregate production is the sum of tourism and manufacturing production given by
where
Tourism sector
Given the empirical results and the common specification in the tourism literature (Chen et al., 2016), we assume that the tourism firms leverage labour
where
where
Manufacturing sector
The setting of the manufacturing sector’s production is standard. Each producer employs capital
where
where
Government
The government plays the role of redistributing the resources among different sectors in the economy. The only source of revenue is from the tax levied on foreign tourists’ consumption, whereas the flow of tax revenue can be redistributed either to households for enhancing overall welfare or to manufacturing firms for promoting sectoral production. Manufacturing subsidies can be conducted in two different ways: production subsidies and investment subsidies. Our purpose is to compare the economic outcomes of the different scenarios and make a policy prescription based on that.
Households transfer
In the benchmark scenario, the government levies taxes on the tourism consumption of inbound tourists
where
Production subsidy
Concerning the possibility of deindustrialization associated with the Dutch disease after a tourism boom, the government may subsidize manufacturers instead of households. In this scenario, the government collects tax revenues from foreign tourists and subsidizes manufacturing production outputs. Then, equation (8) becomes
where
With the production subsidy, the manufacturing firm’s marginal product is higher than without; hence, at the optimum, the manufacturing firm will potentially hire more labour and has more capital in production. This ultimately heightens the production outputs and increases wages and capital returns.
Investment subsidy
The second way to subsidize the manufacturing sector is investments in manufacturing capital. In this scenario, the government collects tax revenues from foreign tourists and subsidizes households who invest in manufacturing capital. Households’ budget constraint (2) becomes
where
With investment subsidies for the manufacturing sector, households will find it attractive to postpone consumption for investment, particularly in the manufacturing sector. What we expect is that the consumption of manufacturing goods drops, whereas the investment in the manufacturing sector rises. When the total consumption is lower, the investment becomes higher. Higher investments result in more capital, thus leading to a higher marginal product of labour and higher wages.
By combining the households’ budget constraint (2), the definitions of both the tourism and manufacturing firms’ profit maximization (6) and (8) and the government’s budget constraint in three different scenarios (9), (10) and (11), respectively, the economy-wide resource constraint is given by
where
It is worth noting that in departing from the common aggregate resource constraint of a closed economy, the revenue from inbound tourism taxation
Equilibrium condition
The equilibrium in this model economy is defined by a sequence of prices
Model parameterization and results
Due to the complexity of our specified model, we are not able to solve it analytically. Therefore, we turn to numerical simulations. It is widely known that Dynare is a powerful software platform for handling a broad class of economic models, especially DSGE models. We, therefore, resort to the Dynare toolbox for all numerical calculations for the specified model (Collard and Juillard, 2009).
Model calibration
The economy we are investigating in this study is Thailand, a major tourism-based country in the Southeastern Asian region. Other countries in this region like Malaysia and the Philippines can also serve our purpose, but the main reason we selected Thailand is due to the size of its tourism sector and its economic importance in the region. The calibration procedure is based on the statistical data and previous studies in general and for Thailand in particular, which is a standard practice to calibrate parameter values (Gomme and Rupert, 2007). The macro data for unknown parameters are mainly obtained from Aroonrueangaram (2013) covering the period 2002–2012. At the outset, we specify various parameter values throughout various equations proposed. These include the following: β, households’ subjective discount factor indicating the patience of households regarding the future; σ, the inverse of the elasticity of intertemporal substitution of consumption in different time periods; θ, the inverse Frisch elasticity of the labour supply; ψ, the weights of labour in the utility;
Since the model is specified on a quarterly basis, the discount factor β is set to 0.99, which corresponds to a steady-state real interest rate of 4% (Alp and Elekdag, 2012). We set
Model description and parameterization.
Note: WTTC: World Travel & Tourism Council.
Numeric simulation
Equipped with all the parameter values, we are ready to numerically solve and simulate the model when the system is externally shocked by the tourism demand from foreign tourists
Benchmark results
In the DSGE model, we describe the mechanisms through which foreign tourists’ demand shock affects the dynamics of the destination country’s economy when the government transfers tax proceeds to domestic households. This shock may occur as a result of either an increase in foreigners’ income or domestic policies designed for attracting foreign visitors. Figure 2 provides the IRFs of the model’s main endogenous variables to a 1% positive shock to foreign tourists’ demand from the benchmark calibration; the ordinate shows the variables’ percentage deviations from their steady states. In the benchmark case, we find that a positive demand shock raises the consumption of foreign tourists (

Impulse responses of the system to external tourism demand shock (different shock persistence).
Surprisingly, the occurrence of the Dutch disease does not necessarily cause an automatic welfare loss.
7
After the economy is hit by highly persistent shocks to foreign tourism demand, long-lasting foreign tourist arrivals bring huge and persistent amounts of foreign exchange to the destination country, which ultimately reaches households’ pockets through government transfers. The strong wealth effect increases domestic consumers’ consumption of goods and leisure, so the consumption of manufacturing goods
Results with different shock persistence
Next, we conduct another simulation experiment with different persistence levels of foreign tourism demand. By persistence, we mean the time required for the shock to disappear entirely: the larger the persistence is, the longer the time needed for the shock to disappear altogether. In fact, when tourism firms and other stakeholders have a clear appreciation of the volatility in tourism demand, they may adopt strategies to reap the benefits of positive effects or avoid being victimized by a negative effect. By confronting the shock with different levels of persistence, the economy may respond in quite different ways. In our case, the parameter capturing the persistence of foreign tourists demand shock, ρ, can be empirically calibrated from the first-order autocorrelation coefficient in the time-series analysis of inbound tourism demand (George Assaf et al., 2010). Although important, the exact value of ρ is not without controversies. Assaf et al. (2012) find mixed degrees of persistence for tourists from different countries, but most of the sample countries have autocorrelation coefficients between 0.5 and 0.9. Barros et al. (2014) studied the persistence characteristics of tourist arrivals from four Nordic countries in Madeira and find similar results. Therefore, we raise the autocorrelation coefficient to
Results with production subsidy
Because of the Dutch disease, the government is motivated to balance the development of the manufacturing and tourism sectors. For this purpose, the government may collect tax revenues from foreign tourists and provide subsidies to manufacturers instead of households as the first option. With production subsidies, a manufacturing firm’s marginal product would be higher than without, so at the optimum, the manufacturing firm hires more labour and uses more capital in the production. Hence, the output will be higher, and wages and capital returns will also rise. All these results are reflected in Figure 3, in which the IRFs of the benchmark (solid) and production subsidy cases (dashed) are plotted. From the IRFs, we can clearly see that the effect is very modest and that the main impact results from manufacturing labour

Impulse responses of the system to external tourism demand shock (benchmark vs. subsidies).
Results with investment subsidy
Alternatively, the government has a second option to subsidize the manufacturing sector: by collecting tax revenues from foreign tourists and subsidizing households who invest in manufacturing capital. With investment subsidies for the manufacturing sector, households will find it attractive to postpone consumption for investment, particularly for goods in the manufacturing sector. Figure 3 plots the IRFs of the model’s main endogenous variables in the investment subsidy scenario (dotted). We can observe that the dynamics of the model economy are dramatically changed. From the manufacturing sector, the subsidy would postpone consumption
Discussion about welfare
As we argued, if the government is concerned about the reallocation of resources between the tourism and manufacturing sectors, it can subsidize the manufacturing sector instead of making transfers to households when confronting the shock. The Dutch disease can potentially be mitigated in this way. The first option is production subsidies, which mainly work as an intra-temporal factor. This option can raise consumption and labour slightly compared to those in the benchmark scenario, but the overall effect is very modest. The Dutch disease weakens only marginally, and welfare improves marginally also. On the other hand, investment subsidies, as the second option, play a much stronger role intertemporally in postponing consumption for investment. With strong motives to invest, manufacturing firms would produce more while simultaneously hiring more labour. Therefore, immediately after the shock, consumption is lower and labour is higher compared to the benchmark scenario, and welfare is lower at the beginning. As time goes by, higher investment transfers to larger stocks of capital, and consumption is persistently above the steady state with the support of large amounts of capital. Welfare also strongly improves persistently. To sum up, investment subsidies lower the welfare at the beginning, but they keep it above the steady state for a longer period. If the government wants to take advantage of the external tourism boom and get the most out of it over the long term, it should turn to investment subsidies. Production subsidies are the choice for short-term purposes. Table 3 summarizes the results of the modelled economy confronting the external tourism boom. The Dutch disease occurs completely (output, investment and capital) in the first two scenarios, while investment subsidies cure the symptoms related to investment and capital, only leaving output for a very short period of time (2–3 quarters). Welfare gains can be obtained in all three scenarios, but there is a trade-off between production and investment subsidies. Production subsidies are better if short run gains are preferred, while investment subsidies outperform if the long term is the focus. The comparison is shown in Figure 4 with a longer time horizon to display variables’ tendencies to revert to the steady state.
Comparison of three different scenarios.
* The magnitude comparison based on the benchmark results.

Impulse responses to external tourism demand shock (welfare with longer horizon).
Conclusion
We developed a two-sector DSGE model, and we numerically solved and simulated the model to understand the tourism-induced Dutch disease in a small open economy like Thailand. Our results confirmed the existence of the tourism-induced Dutch disease highlighted in past studies (Capó et al., 2007; Forsyth et al., 2014; Inchausti Sintes, 2015; Pham et al., 2015). Through the dynamic analysis using IRFs and structure modelling of each agent in the economy, our results provided a more holistic view of the channels contributing to the tourism-induced Dutch disease as well as the dynamic effects of external tourism booms on a small open economy. Nevertheless, our results show that an externally driven tourism boom can actually improve welfare, albeit with the coexistence of the Dutch disease. When the government transfers tax proceeds to households, there is a wealth effect leading to higher consumption and lower labour over time after the shock hitting the economy, thereby making the households better off.
Sheng (2011) theoretically examined, in a general equilibrium framework, the impacts of combining tourism taxes and non-tourism subsidies on a small tourism-dependent economy. He found that the policy is not effective, but claimed that the issue needs to be further investigated through solid empirical studies. Based on the benchmark DSGE analysis, we further extended the model to understand the impacts of two government policies on alleviating the Dutch disease. To maintain resources within the manufacturing sector, the government can promote it using either production subsidies or investment subsidies. After comparison with model simulation, we found that production subsidies only work marginally, whereas investment subsidies can almost overturn the Dutch disease. In terms of welfare, production subsidies are mainly effective over the short term, while investment subsidies work better in the long run. For policy implication, there is a trade-off for the policymakers to cure tourism-induced Dutch disease and make tourism development sustainable over time. In order to contain the symptom, the short-term welfare has to be sacrificed, while an overlook of Dutch disease would ultimately harm the economy over the long term. The exact implementation of policy may need a more comprehensive calculation of the trade-off.
Our work provides the initial step to bring the DSGE framework into the study of the economics of tourism and its relationship with other sectors in the overall economy. As a preliminary research endeavour, this article did not consider a hybrid subsidy policy that includes a combination of investment and production subsidies. The ratio of the two subsidies can be endogenous based on the goal of the government. Our results show a great potential for studying both theoretical and empirical tourism issues by applying the DSGE methodology, and there is plenty of room for further extension. For instance, it will be particularly interesting to see how different policies that are used to promote the tourism sector perform over time, how the strengthened tourism sector can give a feedback effect to the rest of the economy and how the tourism sector behaves as part of the transmission mechanism absorbing or propagating other shocks that are hitting the economy, among other issues. We will leave these for future research endeavours.
Supplemental material
Supplemental Material, Appendix - Prescribing for the tourism-induced Dutch disease: A DSGE analysis of subsidy policies
Supplemental Material, Appendix for Prescribing for the tourism-induced Dutch disease: A DSGE analysis of subsidy policies by Hongru Zhang and Yang Yang in Tourism Economics
Footnotes
Declaration of conflicting interests
The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.
Funding
The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This work was supported by the National Social Science Foundation of China under Grant 17AJY030 and Jiangxi University of Finance and Economics Faculty Research Seed Fund under Grant K62192012.
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Notes
References
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