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1.
PLoS One ; 19(2): e0295443, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38335239

RESUMO

Multinational enterprises frequently divest their foreign assets in the current economic environment. Existing research, based on friction theory, has mainly focused on the impacts of political and economic disparities on foreign divestment while neglecting the nuanced influence of cultural factors. To address this gap, this paper draws on the cultural friction perspective to capture the diverse cultural resistance faced by each enterprise and explore the relationship between cultural friction and foreign divestment. Data from Chinese publicly listed enterprises engaged in foreign investment are leveraged, and a dual-level analysis is conducted using Logit panel regression and Cox survival analysis to examine the relationship between cultural friction and foreign divestment from both the viewpoints of the parent company and the overseas subsidiary. Additionally, the paper examines the marginal factors that affect the relationship between them from an institutional perspective. The findings reveal that cultural friction has a positive influence on the propensity of multinational enterprises to divest from foreign markets. Interestingly, a "formal institutional distance paradox" is demonstrated in our study, and politically connected enterprises are found to be more vulnerable to foreign divestment due to the "curse of political affiliations".


Assuntos
Comércio , Cultura , Investimentos em Saúde , Política , China , Internacionalidade , Investimentos em Saúde/economia , Comércio/economia , Comércio/organização & administração
2.
PLoS One ; 19(2): e0296021, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38315684

RESUMO

China is actively promoting the development of a robust trading nation. In this context, utilizing data from China's A-share listed companies spanning from 2003 to 2021, this study investigates the impact of foreign shareholders on enterprises in a scenario where overseas sales reduce the profit margin of Chinese firms. The findings reveal that overseas sales do indeed decrease the profit margin of Chinese enterprises; however, foreign shareholders mitigate this negative effect and various robustness tests support this conclusion. Mechanism analysis confirms that foreign shareholders primarily enhance enterprise productivity through improved production technology spillover effects, thereby alleviating the adverse impact of overseas sales on Chinese firms' profit margins. Heterogeneity analysis demonstrates that both longer holding periods for foreign shareholders and multiple foreign shareholders significantly alleviate the negative influence of overseas sales on Chinese firms' profit margins. Moreover, there is significant heterogeneity in how foreign shareholders alleviate these detrimental consequences based on property rights nature, institutional environment, overseas related party transactions and subsidiaries, as well as industry attributes. These findings have important reference value for China's efforts towards becoming a strong trading nation and can contribute to enhancing trade capacity in other countries.


Assuntos
Comércio , Indústrias , Investimentos em Saúde , China , Comércio/economia , Indústrias/economia , Investimentos em Saúde/economia , Internacionalidade
3.
PLoS One ; 18(11): e0293825, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-38011123

RESUMO

This paper examines the linkage between Chinese stock market volatility and investor attention fluctuation. In Heterogeneous autoregressive (HAR) model, first, we analyzed the linkage between both decomposed and undecomposed stock market realized volatility and investor attention fluctuations across full-sample and two-year moving window sub-samples. Second, we compare the predictive power of four models in short-, medium-, and long-term volatility forecasting. Empirical results show large positive attention fluctuation amplified Chinese stock market volatility after the outbreak of COVID-19, and negative small attention fluctuation significantly stabilized stock market volatility before COVID-19, and the impact dwindled in after COVID-19. The model incorporating decomposed realized volatility and decomposed attention fluctuation performs better in volatility Forecasting. This research underscores a shift in the dynamics between stock market volatility and investor attention fluctuations, and investor attention fluctuation improves the volatility forecasting accuracy of the Chinese stock market.


Assuntos
Povo Asiático , Investimentos em Saúde , Humanos , China/epidemiologia , COVID-19/epidemiologia , Surtos de Doenças , Investimentos em Saúde/economia , Atenção , Economia
4.
PLoS One ; 18(10): e0290126, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-37844110

RESUMO

Based on the data of the Chinese A-share listed firms in China Shanghai and Shenzhen Stock Exchange from 2014 to 2021, this article explores the relationship between common institutional investors and the quality of management earnings forecasts. The study used the multiple linear regression model and empirically found that common institutional investors positively impact the precision of earnings forecasts. This article also uses graph neural networks to predict the precision of earnings forecasts. Our findings have shown that common institutional investors form external supervision over restricting management to release a wide width of earnings forecasts, which helps to improve the risk warning function of earnings forecasts and promote the sustainable development of information disclosure from management in the Chinese capital market. One of the marginal contributions of this paper is that it enriches the literature related to the economic consequences of common institutional shareholding. Then, the neural network method used to predict the quality of management forecasts enhances the research method of institutional investors and the behavior of management earnings forecasts. Thirdly, this paper calls for strengthening information sharing and circulation among institutional investors to reduce information asymmetry between investors and management.


Assuntos
Administração Financeira , Indústrias , Investimentos em Saúde , China , Revelação , Administração Financeira/economia , Administração Financeira/organização & administração , Administração Financeira/normas , Previsões , Indústrias/economia , Indústrias/organização & administração , Indústrias/normas , Investimentos em Saúde/economia , Investimentos em Saúde/organização & administração , Aprendizado de Máquina , Redes Neurais de Computação
5.
PLoS One ; 18(10): e0293284, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-37871103

RESUMO

This paper empirically investigates the impact mechanism of short-term debt for long-term use and the default risk of supply chain firms with the data of Chinese A-share listed firms from 2007 to 2021. The study shows that there is a significant U-curve relationship between short-term debt for long-term use and supply chain firms' default risk, and too high or too low a level of short-term loans and long-term investments will worsen firms' default risk. In addition, firm performance plays an mediating effect in the process of short-term debt for long-term investment affecting the default risk of supply chain firms. Finally, customer effect and firm heterogeneity play a moderating role in the impact of short-term loans and long-term investments on the default risk of supply chain firms, and the U-shaped relationship will be strengthened under the high-intensity customer effect. This study has important theoretical and practical significance for analyzing the impact of default risk contagion in supply chain enterprises.


Assuntos
Comércio , Indústrias , Investimentos em Saúde , China , Investimentos em Saúde/economia , Comércio/economia , Indústrias/economia
6.
Environ Sci Pollut Res Int ; 30(37): 87199-87214, 2023 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-37418190

RESUMO

Solving the crash risk problem of corporate stock price caused by information asymmetry can mitigate the negative externality of its carbon emission to become green, low-carbon, and high-quality development. Green finance generally profoundly impacts micro-corporate economics and macro-financial systems but remains a giant puzzle of whether they can effectively resolve the crash risk. This paper examined the impact of green financial development on the stock price crash risk using the sample data of non-financial listed companies in Shanghai and Shenzhen A stock market in China from 2009 to 2020. We found that green financial development significantly inhibits the stock price crash risk; this is more obvious in listed companies with a high level of asymmetric information. And companies in high-level regions of green financial development attracted more attention from institutional investors and analysts. As a result, they disclosed more information about their operational status, thus reducing the crash risk of corporate stock price from the torrential public pressure of lousy environmental details. Therefore, this study will help continuously discuss the costs, benefits, and value promotion of green finance for synergy between corporate performance and environmental performance to improve ESG capabilities.


Assuntos
Desenvolvimento Econômico , Desenvolvimento Sustentável , Carbono , China , Desenvolvimento Sustentável/economia , Investimentos em Saúde/economia , Comércio/economia , Disseminação de Informação
7.
Environ Sci Pollut Res Int ; 30(34): 82286-82296, 2023 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-37326741

RESUMO

This study examines how financial technology (FinTech) and green bonds have affected the ability of firms to finance energy efficiency measures by using data obtained from a subset of Chinese companies listed on the A-share market between 2011 and 2021. We apply the quantile-on-quantile method, which allows us to examine the interdependence of time series in each economy separately and yields data on the global and national levels indicating the relationship between the variables. The results show that an increase in both direct and indirect financing for businesses, as well as inter-bank competition, can greatly mitigate the financial limitations that firms suffer as a result of FinTech expansion. Our estimates show that the energy efficiency of the countries we chose improves when they are financed with green bonds across all quantiles of the data. Organizations not owned by the state, SMBs, and the more rapidly developing eastern half of China promise to benefit the most from the moderating effect of FinTech because of the faster pace of development there. The immediate ameliorating effect that financial technology has on reduced lending criteria mostly benefits businesses with either a strong innovation rate or a poor social responsibility performance rate. This is because businesses sharing either of these features are more likely to experiment and develop new products. Both theoretical and practical repercussions of this finding are explored.


Assuntos
Investimentos em Saúde , Desenvolvimento Sustentável , China , Comércio/economia , Investimentos em Saúde/economia , Responsabilidade Social , Desenvolvimento Sustentável/economia , Tecnologia Digital/economia , Conta Bancária
8.
Environ Sci Pollut Res Int ; 30(36): 85592-85610, 2023 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-37391561

RESUMO

The relationship between digital finance and regional green innovation has been partially confirmed, yet the role of environmental regulation in it remains unexplored. Therefore, this paper examines the impact of digital finance on regional green innovation and tests the moderating role of environmental regulation using Chinese city-level data from 2011 to 2019 as a research sample. The results show that digital finance can significantly promote regional green innovation by alleviating regional financing constraints and increasing regional R&D investment. Besides, digital finance has apparent regional difference effects (the contribution of digital finance to regional green innovation is greater in eastern China than in western China, and the development of digital finance in neighbouring regions has a negative transmission effect on local green innovation). Finally, environmental regulation positively moderates the relationship between digital finance and regional green innovation. This paper explores the relationship between digital finance and regional green innovation from the perspective of environmental regulation, providing empirical evidence to promote regional green innovation.


Assuntos
Tecnologia Digital , Desenvolvimento Econômico , Política Ambiental , Investimentos em Saúde , Desenvolvimento Sustentável , China , Desenvolvimento Econômico/legislação & jurisprudência , Investimentos em Saúde/economia , Investimentos em Saúde/legislação & jurisprudência , Desenvolvimento Sustentável/economia , Desenvolvimento Sustentável/legislação & jurisprudência , Política Ambiental/economia , Política Ambiental/legislação & jurisprudência , Tecnologia Digital/economia , Tecnologia Digital/legislação & jurisprudência
9.
PLoS One ; 18(6): e0287615, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-37352229

RESUMO

In modern enterprises with a separation of powers, the ultimate controller can effectively influence the implementation of corporate strategy and operational management efficiency, as well as improve corporate governance by monitoring and limiting the management entrenchment effect within enterprises. Based on the information pertaining to ultimate controllers disclosed by enterprises in their annual reports, this study empirically tested whether the absence of the ultimate controller impacts investment efficiency using the data of Chinese A-share listed companies from 2007 to 2020. It was found that the investment efficiency of enterprises without ultimate controllers is relatively lower than those with ultimate controllers. This is reflected in the insufficient investment of enterprises without an ultimate controller. Moreover, the effect is more significant when the financial environment, internal governance environment, and external governance environment of firms are worse. The mechanism analysis demonstrated that the absence of an ultimate controller causes a more severe insider agency problem and a significantly higher degree of financing constraints, which leads to underinvestment and reduces investment efficiency of firms. The economic consequence test also found that the inefficient investment caused by the absence of ultimate controllers would damage the future value of enterprises, but would increase managers' compensation. Overall, this study suggests that ultimate controllers are an important part of a firm's internal governance, especially for monitoring management behavior and resolving agency conflicts.


Assuntos
Indústrias , Investimentos em Saúde , China , Investimentos em Saúde/economia , Investimentos em Saúde/organização & administração , Indústrias/economia , Indústrias/organização & administração , Comércio/economia , Comércio/organização & administração , Política Organizacional , Eficiência Organizacional/economia
10.
Healthc Policy ; 18(3): 25-30, 2023 02.
Artigo em Inglês | MEDLINE | ID: mdl-36917451

RESUMO

Following Lee and colleagues' (2023) article explaining how Canadians are being shortchanged by drug companies when it comes to investments in research and development (R&D), this rejoinder adds context and appends two other very problematic elements in the debate between wishful narratives over the industry's contribution in R&D and actual numbers. First, even the current stricter definition of R&D investment might simply be too large considering that elements such as seeding trials - a well-known marketing device - can be accounted for as R&D expenditures. Second, this rejoinder identifies how Statistics Canada acted in concert with Innovative Medicines Canada to reinforce the industry's preferred narratives around R&D expenditures. This situation puts into question the trustworthiness of Canada's statistical agency.


Assuntos
Desenvolvimento de Medicamentos , Indústria Farmacêutica , Investimentos em Saúde , Preparações Farmacêuticas , Pesquisa Farmacêutica , Humanos , Canadá , Indústria Farmacêutica/economia , Investimentos em Saúde/economia , Preparações Farmacêuticas/economia , Pesquisa Farmacêutica/economia , Desenvolvimento de Medicamentos/economia
11.
Comput Intell Neurosci ; 2022: 1954164, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-36238669

RESUMO

This paper selects the relevant data of Shanghai and Shenzhen NG listed companies from 2016 to 2020 as the research object. By drawing on relevant research results at home and abroad, the variable KZ is used to measure the degree of corporate financing constraints, and the variable Tobin Q is used to measure corporate performance. The test draws the following conclusions: financing constraints are conducive to improving corporate performance. The reason is that the higher the degree of corporate financing constraints is, the more cautious the managers are in the use of funds, and the company managers can formulate more scientific management strategies, so as to improve corporate performance. Through further research, it is found that, with the expansion of the scale of the enterprise, the degree of financing constraints has less negative impact on the performance of the enterprise. Performance has a positive impact. According to the above conclusions, the government should improve the financial market system, build a multilevel capital market, and fundamentally ease the financing constraints of enterprises, to develop and improve self-management.


Assuntos
Comércio , Investimentos em Saúde , China , Comércio/organização & administração , Humanos , Investimentos em Saúde/economia
12.
PLoS One ; 17(2): e0263689, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35180235

RESUMO

Financial portfolio management (PM) is one of the most applicable problems in reinforcement learning (RL) owing to its sequential decision-making nature. However, existing RL-based approaches rarely focus on scalability or reusability to adapt to the ever-changing markets. These approaches are rigid and unscalable to accommodate the varying number of assets of portfolios and increasing need for heterogeneous data input. Also, RL agents in the existing systems are ad-hoc trained and hardly reusable for different portfolios. To confront the above problems, a modular design is desired for the systems to be compatible with reusable asset-dedicated agents. In this paper, we propose a multi-agent RL-based system for PM (MSPM). MSPM involves two types of asynchronously-updated modules: Evolving Agent Module (EAM) and Strategic Agent Module (SAM). An EAM is an information-generating module with a Deep Q-network (DQN) agent, and it receives heterogeneous data and generates signal-comprised information for a particular asset. An SAM is a decision-making module with a Proximal Policy Optimization (PPO) agent for portfolio optimization, and it connects to multiple EAMs to reallocate the corresponding assets in a financial portfolio. Once been trained, EAMs can be connected to any SAM at will, like assembling LEGO blocks. With its modularized architecture, the multi-step condensation of volatile market information, and the reusable design of EAM, MSPM simultaneously addresses the two challenges in RL-based PM: scalability and reusability. Experiments on 8-year U.S. stock market data prove the effectiveness of MSPM in profit accumulation by its outperformance over five different baselines in terms of accumulated rate of return (ARR), daily rate of return (DRR), and Sortino ratio (SR). MSPM improves ARR by at least 186.5% compared to constant rebalanced portfolio (CRP), a widely-used PM strategy. To validate the indispensability of EAM, we back-test and compare MSPMs on four different portfolios. EAM-enabled MSPMs improve ARR by at least 1341.8% compared to EAM-disabled MSPMs.


Assuntos
Tomada de Decisões , Aprendizado Profundo/economia , Administração Financeira/métodos , Marketing/métodos , Reforço Psicológico , Humanos , Investimentos em Saúde/economia
13.
PLoS One ; 17(1): e0262539, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35085306

RESUMO

In recent years, online lending has created many risks while providing lending convenience to Chinese individuals and small and medium-sized enterprises. The timely assessment and prediction of the status of industry indicators is an important prerequisite for effectively preventing the spread of risks in China's new financial formats. The role of investor sentiment should not be underestimated. We first use the BERT model to divide investor sentiment in the review information of China's online lending third-party information website into three categories and analyze the relationship between investor sentiment and quantitative indicators of online lending product transactions. The results show that the percentage of positive comments has a positive relationship to the borrowing interest rate of P2P platforms that investors are willing to participate in for bidding projects. The percentage of negative comments has an inverse relationship to the borrowing period. Second, after introducing investor sentiment into the long short-term memory (LSTM) model, the average RMSE of the three forecast periods for borrowing interest rates is 0.373, and that of the borrowing period is 0.262, which are better than the values of other control models. Corresponding suggestions for the risk prevention of China's new financial formats are made.


Assuntos
Indústrias/economia , Investimentos em Saúde/economia , Atitude , Conscientização , Previsões , Humanos
14.
PLoS One ; 17(1): e0261835, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35030202

RESUMO

This study investigates the reaction of stock markets to the Covid-19 pandemic and the Global Financial Crisis of 2008 (GFC) and compares their influence in terms of risk exposures. The empirical investigation is conducted using the modified ICSS test, DCC-GARCH, and Diebold-Yilmaz connectedness analysis to examine financial contagion and volatility spillovers. To further reveal the impact of these two crises, the statistical features of tranquil and crisis periods under different time intervals are also compared. The test results show that although the outbreak's origin was in China, the US stock market is the source of financial contagion and volatility spillovers during the pandemic, just as it was during the GFC. The propagation of shocks is considerably higher between developed economies compared to emerging markets. Additionally, the results show that the COVID-19 pandemic induced a more severe contagious effect and risk transmission than the GFC. The study provides an extensive examination of the COVID-19 pandemic and the GFC in terms of financial contagion and volatility spillovers. The results suggest the presence of strong co-movements of world stock markets with the US equity market, especially in periods of financial turmoil.


Assuntos
COVID-19 , Investimentos em Saúde , COVID-19/economia , China , Comércio/economia , Humanos , Investimentos em Saúde/economia , Pandemias/economia , Estados Unidos
15.
PLoS One ; 16(12): e0261184, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34910785

RESUMO

CAMEL is considered one of the well-known banking rating systems used to build a proper bank ranking. In our paper, we investigate the CAMEL rating for Saudi banks, which is considered the second largest banking sector in GCC. The Saudi banking sector consists of 11 banks and is the leading sector in the Saudi stock index (TASI). In this research, we aim to determine the ranking of Saudi banks according to CAMEL composite and CAMEL overall ratings and explore the effects of these ratings on banks' total deposits for the period from 2014 to 2018. The methodology involves four phases. In the first phase, we calculate the key financial ratios of CAMEL's composites for each bank. In the second phase, we rank the banks from 1 to 11 to each one of CAMEL's composites for each bank per year. In the third phase, we rank Saudi banks according to CAMEL composite and CAMEL overall. Finally, in the fourth phase, we run a regression model using CAMEL financial ratios rank as independent variable and banks' total deposits as a dependent variable. Using the stepwise regression method, the results indicated that the best regression model has an adjusted R2 of 73.4% and a standard error of around 0.58. The results further indicated that capital measured by CAR, management as an efficiency ratio, earning with ROE proxy, and liquidity as loans to deposits have positive effects on banks' total deposits. Meanwhile, earnings as net interest income to net revenue and liquidity calculated by CASA have a negative effect on banks' total deposits. Finally, asset quality ratios and the rest of the ratios have no significant effect on banks' total deposits.


Assuntos
Financiamento de Capital/normas , Administração Financeira , Investimentos em Saúde/economia , Financiamento de Capital/economia , Humanos , Arábia Saudita
16.
PLoS One ; 16(12): e0260132, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34874945

RESUMO

Understanding how textual information impacts financial market volatility has been one of the growing topics in financial econometric research. In this paper, we aim to examine the relationship between the volatility measure that is extracted from GARCH modelling and textual news information both publicly available and from subscription, and the performances of the two datasets are compared. We utilize a latent Dirichlet allocation method to capture the dynamic features of the textual data overtime by summarizing their statistical outputs, such as topic distributions in documents and word distributions in topics. In addition, we transform various measures representing the popularity and diversity of topics to form predictors for a rolling regression model to assess the usefulness of textual information. The proposed method captures the statistical properties of textual information over different time periods and its performance is evaluated in an out-of-sample analysis. Our results show that the topic measures are more useful for predicting our volatility proxy, the unexplained variance from the GARCH model than the simple moving average. The finding indicates that our method is helpful in extracting significant textual information to improve the prediction of stock market volatility.


Assuntos
Investimentos em Saúde/economia , Modelos Econométricos , Padrões de Referência
18.
Multimedia | Recursos Multimídia | ID: multimedia-9463

RESUMO

A saúde digital é de suma importância para a qualificação das informações adequadas. Esta live conduzida pelo Conasems em parceria com o Ministério da Saúde (SAPS e DATASUS) tem o objetivo de apresentar e esclarecer aspectos dos projetos de Conectividade das Unidades Básicas de Saúde e o Informatiza APS, além da Rede Nacional de Dados em Saúde - RNDS. Será um momento importante para que os municípios possam se apropriar do que está em andamento e as melhorias que irão ocorre.


Assuntos
Informática em Saúde Pública/economia , Centros de Saúde , Estratégias de eSaúde , Acesso à Internet , Atenção Primária à Saúde , Registros Eletrônicos de Saúde , Sistemas de Informação em Saúde , Investimentos em Saúde/economia , Governo Local , Parcerias Público-Privadas , Conselhos de Saúde ,
19.
PLoS One ; 16(11): e0259452, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34748594

RESUMO

The pressure upon local governments to redeem their debt could affect government fiscal ability. It could consequently affect their fiscal policies on corporations, which might distort corporate innovation. Based on the data of Chinese Shanghai and Shenzhen A-share listed companies and the local government implicit short-term debt financed by local government financing vehicles (LGFVs) in 31 provinces, this paper shows that local government debt (LGD) negatively affects corporate R&D investment in China, thereby suggesting a strong crowding-out effect. The crowding-out effect is more pronounced when the firm is a non-state-owned enterprise (NSOE), the firm's size is small, the firm's age is young, or the firm is in the lower market competition. This paper provide evidence by interacting the terms that local government actions, such as consumption of fiscal resources, strengthening tax collection efforts, or consumption of credit resources, might partially account for the crowding-out effect. This study illustrates the innovation costs of local government debt.


Assuntos
Comércio/organização & administração , Criatividade , Financiamento Governamental/economia , Política Fiscal , Investimentos em Saúde/economia , Governo Local , China , Financiamento Governamental/métodos , Humanos
20.
PLoS One ; 16(11): e0259308, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34748595

RESUMO

The risk spillover among financial markets has been noticeably investigated in a burgeoning number of literature. Given those doctrines, we scrutinize the impact persistence of volatility spillover and illiquidity spillover of Chinese commodity markets in this paper. Based on the sample from 2010 to 2020, we reveal that there is a cross-market spillover of volatility and illiquidity in China and also, interactions between volatility and illiquidity in different financial markets are pronounced. More importantly, we demonstrate that different commodity markets have different responsiveness to stock market shocks, which embeds their market characteristics. Specifically, we discover that the majority of the traders in gold market might be hedger and therefore gold market is more sensitive to stock market illiquidity shock and thus the shock impact in persistent. On the other hand, agricultural markets like corn and soybean markets might be dominated by investors and thus those markets respond to the stock market volatility shocks and the shock impact in persistent over 10 periods given the first period of risk shock happening. In fact, different Chinese commodity markets' responsiveness towards Chinese stock market risk shocks indicates the stock market risk impact persistence in Chinese commodity markets. This result can help policymakers to understand the policy propagation effect according to this risk spillover channel and risk impact persistence mechanism in China.


Assuntos
Agricultura/economia , Comércio/economia , Investimentos em Saúde/economia , Marketing/economia , Metais/provisão & distribuição , Políticas , China , Humanos , Modelos Estatísticos , Fatores de Risco
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