Abstract:
بیماری های همه گیر، بخش جدایی ناپذیر تاریخ جوامع بشری هستند و همواره آثار بلندمدت آنها مورد توجه قرار گرفته است. شیوع ویروس کووید-19 در اواخر سال 2019 باعث شد تا اقتصاددانان با استفاده از الگوهای مختلف که معمولا بر پایه تعادل جزئی بودند، به بررسی آثار اقتصادی شیوع یک بیماری همه گیر بپردازند. در این مطالعه، با انگیزه درک اثر شیوع یک بیماری همه گیر و پاسخ های سیاستی آن بر شرایط اقتصاد و سلامت، از الگوی تعادل عمومی تصادفی پویا و دیدگاه کینزی جدید استفاده شده است. بررسی توابع عکس العمل متغیرها به تکانه سلامت ناشی از شیوع یک بیماری همه گیر، حاکی از کاهش ساعات اشتغال، تولید، مصرف، سرمایه گذاری، وضعیت سلامت و افزایش تورم است. در پاسخ به این شرایط، افزایش مخارج سلامت عمومی به همگرایی سریع تر متغیرهای کلان اقتصادی به مقدار شرایط پایدار خود منجر می شود. با توجه به نتایج حاصل از شبیه سازی، پیشنهاد می گردد که دولت ها از تجربیات مرتبط با موج اول شیوع بیماری استفاده و خود را به ابزارهای لازم مجهز کرده تا در زمان قرنطینه اجتماعی موقت نیز از آنها استفاده کنند (مانند توانایی انجام آزمایش ها بر روی بخش بزرگی از جمعیت). توانایی شناسایی افراد آلوده و تحمیل قرنطینه های شخصی به جای قرنطینه های بی رویه، رکود را کاهش می دهد. راه حل دیگر برای کنترل یک بیماری همه گیر، واکسینه کردن جمعیت انبوه برای دستیابی به ایمنی گله ای است. یک برنامه موفق واکسیناسیون، میتواند نیاز به سیاست های سخت گیرانه قرنطینه و قرنطینه اجباری را کاهش دهد. همه این موارد، مستلزم افزایش مخارج سلامت عمومی است.
Aim and Introduction
Pandemic diseases are an integral part of the history of human societies and their long-term effects have always been considered. The outbreak of the Covid-19 disease at the end of 2019 caused economists to investigate its economic effects using different models, which were usually based on partial equilibrium. In this study, with the motivation of understanding the effect of the spread of a pandemic disease and its policy responses on economic and health conditions, the dynamic stochastic general equilibrium model and the new Keynesian perspective have been used. Examining the impulse response functions of the variables to the health shock caused by the Covid-19 outbreak indicates a decrease in employment hours, production, consumption, investment, health status and an increase in inflation. In response to these conditions, the increase in public health expenditure leads to a faster convergence of macroeconomic variables to their steady-state values. According to the results of the simulation, it is suggested that the governments use the experiences related to the first wave of the disease outbreak and equip themselves with the necessary tools to use them during the temporary social quarantine (such as the ability to conduct tests on a large part of the population). The ability to identify infected people and impose personal quarantines instead of compulsory quarantines will reduce stagnation. Another solution to control a pandemic is to vaccinate the mass population to achieve herd immunity. All of these require increased public health spending.
Methodology
The evidence and results of the studies indicate the profound effects of epidemics such as the Covid-19 disease on the economy of countries. In this study, with the motivation of understanding the effect of the spread of epidemic diseases (with an emphasis on the Covid-19) on the economy and the government's policy responses to the dynamics of the macroeconomic variables of Iran, a dynamic stochastic general equilibrium (DSGE) model and the New Keynesian (NK) perspective were used. Unlike computable general equilibrium models, DSGE models are in a random environment, and since the duration of the virus's spread and its impact on the economy are unknown, it is more appropriate to use DSGE models (Yang, Zhang and Chen, 2020). In order to achieve the goals of Jazer's studies, in the first step, a DSGE model based on NK was designed and the effect of an epidemic disease on the macroeconomic variables of Iran was simulated. The designed model was quantified with a three-month (seasonal) frequency and using the data of Iran's economy (2004: 2-2021: 1).
Results and Discussion
The results showed that increasing the risk of health disaster by one standard deviation gradually causes a decline in health status. After that, in order to improve the health status, the quarantine hours were increased, which means an increase in investment in health. On the other hand, since more hours are allocated to quarantine, the hours of employment will decrease and subsequently the final productivity of physical capital will decrease, which is due to the complementarity of labor and capital in Cobb-Douglas production function. Finally, labor income and capital income also decrease. Therefore, production, consumption, and investment fluctuate significantly, and this comes from the optimal choice of the household in the face of this impulse. As a result, as the health status declines and consumption declines, the level of well-being declines (like the result of Yang, Zhang, and Chen, 2020). Over time, the lack of physical capital causes an increase in physical investment and working hours, and finally they slowly return to their previous stable level. In the second step, by applying a change in the AR (1) equation of public health expenditure, the effect of the government's financial reaction on the macroeconomic variables of Iran's economy in the face of the health shock was evaluated. In the base scenario, the government has no intervention in the economy and the state of fiscal inactivity is considered for the government. In another scenario, the active presence of the government, or in other words, the design of discretionary financial policy, affects the economy.
Conclusion
The results showed that the design of a discretionary financial policy in the form of increasing public health expenditure in the context of an epidemic has led to a faster convergence of macroeconomic variables to their stable conditions. In justifying the results, it can be stated that in the face of the outbreak of an epidemic, with the increase in public health expenditure and the subsequent increase in quarantine hours, the employment hours have decreased less. On the other hand, the increase in public health expenditure and the subsequent improvement of health leads to an increase in the productivity of the labor force through the increase in the life expectancy of a person as well as the length of working life. This has led to an increase in household income, followed by an increase in the level of consumption and investment. Also, an increase in public health expenditure leads to an improvement in health status. As a general result, the government's financial reactions in the face of the impulse of an epidemic disease lead to a faster convergence of most variables to their stable conditions in the Iranian economy.
Machine summary:
در این مطالعه ، با انگیزه درک اثر شیوع یک بیماری همه گیر و پاسخ های سیاستی آن بر شرایط اقتصاد و سلامت ، از الگوی تعادل عمومی تصادفی پویا و دیدگاه کینزی جدید استفاده شده است .
World Economic Outlook (به تصویر صفحه مراجعه شود) منبع : صندوق بین المللی پول (٢٠٢٢) شکل ١: درصد زوال پیش بینی تولید ناخالص داخلی در سال ٢٠٢٢ نسبت به پیش بینی قبل از شیوع کووید-١٩ در ژانویه ٢٠٢٠ به تفکیک منطقه * توجه : اقتصادهای پیشرفته ()AE(Advanced Economies )، آسیای نوظهور و در حال توسعه به استثنای چین (EM.
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(به تصویر صفحه مراجعه شود) مأخذ: یافته های پژوهش شکل ٥: اثر ١ انحراف معیار افزایش مخارج سلامت بخش عمومی در مواجهه با شیوع یک بیماری همه گیر در الگوی NK در سناریوی مبنا، حالت انفعال مالی برای دولت در نظر گرفته شده است (خط ممتد قرمز رنگ در شکل ٥).
“The Effect of Monetary Shocks and Oil Shocks on the Production and Inflation of the Housing Sector in Iran's Economy: A New Keynesian Stochastic Dynamic General Equilibrium Approach”.
“Evaluation of Fiscal Policy for Iran's Economy in a Stochastic Dynamic General Equilibrium Model Based on Real Business Cycles”.
In this study, with the motivation of understanding the effect of the spread of a pandemic disease and its policy responses on economic and health conditions, the dynamic stochastic general equilibrium model and the new Keynesian perspective have been used.