We use a gravity model that accounts for multilateral resistance terms (MRT) to examine the impact of economic policy uncertainty (EPU) on a country's export. Empirical analysis based on data from 20 countries that traded with one another (creating 380 pairs of importing-exporting countries) over the period 2002-2016 shows that the export of a country is negatively associated with the EPU of its corresponding importing country, but not with the EPU of the exporting country itself. This effect remains qualitatively unchanged regardless whether the exporting country is a developed or a developing economy and whether it focuses on commodities or non-commodities, but the effect is smaller for commodity exporters. Furthermore, the observed negative effect is more pronounced when the unemployment rate in the importing country is high, whilst GDP growth in the importing country does not influence the focal relationship. These findings advance the literature by highlighting the importance of accounting for the differential effects of policy uncertainty in importing and exporting countries and of taking into consideration country and product heterogeneity when analysing the effects of EPU on exports.
Using DCC-GARCH model, this paper finds that, since 1990, the relationship between crude oil prices and the US dollar index is time-varying, demonstrating a process of 'very weak correlation-negative correlation-enhanced negative correlation-weakening negative correlation', but the existing research does not provide enough reasonable explanation. Therefore, this paper proposed a 'key mediating factors' hypothesis which points out that whether there is a common 'key mediating factor' is important source of the time-varying relationship between two assets. We argue that market trend and financial market sentiment undertook the role of 'key mediating factor' during the period of the 2002 to the financial crisis and financial crisis to 2013, while other periods lack the 'key mediating factors'.
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