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Oil is an important energy resource. Fluctuation in international crude oil prices affects all aspects of the economy. The exchange rate is one of the important channels for the international crude oil price shock to pass to the real economy and financial markets. The impact of international crude oil price fluctuation on the exchange rate of oil-importing countries has attracted more and more attention. The US dollar is the main invoice and settlement currency of the international oil market. The change of the US dollar exchange rate will inevitably affect the international crude oil price. By combing the relevant classic literature and recent literature, the relationship between international crude oil prices and the exchange rate of oil-importing countries is discussed. Due to the different methods of use, the relationship between the two is not conclusive. This paper probes into the impact paths of national crude oil price fluctuation on the exchange rate of oil-importing countries, but the influence level depends on the relative degree of each country affected by oil prices, which cannot be generalized. The article summarizes the methods of studying the relationship between oil prices and exchange rates, most of which are studying the causal relationship between the two and their mutual influence, nonlinear structure, and volatility spillover effects. Through reviewing and summarizing the relevant literatures, this paper argues that exploring the inherent laws of oil price volatility buffer under different exchange rate regimes and studying the transmission mode and intensity of oil price fluctuations on exchange rate effects can be the focus of future research. [ABSTRACT FROM AUTHOR]

We analyze and identify the factors that influence coal price fluctuations and construct a system dynamics model of these factors. The simulation results show that the trend in China's future coal prices first declines and then rises, that the trends of coal supply and consumption in China are quite similar, both exhibiting a rising tendency, and that the gap between supply and demand is small and that the market is essentially in equilibrium. However, the increase in the coal industry profit margins also entails an increase in coal prices, and the magnitude of coal price increases also gradually grows. Greater adjustment coefficient factors lead to higher simulated coal price values, and the magnitude of increase also tends to rise. On the one hand, the greater the coal industry policy coefficient is, the closer the simulated coal price is to the value in the real scenario. On the other hand, the smaller the coal industry policy coefficient is, the greater the extent to which the coal price deviates from the real simulated value. [ABSTRACT FROM AUTHOR]