This paper examines the effect of economic policy uncertainty and its components on firm-level investment. It is found that economic policy uncertainty in interaction with firm-level uncertainty depresses firms' investment decisions. When firms are in doubt about costs of doing business due to possible changes in regulation, cost of health care and taxes, they become more guarded with investment plans. The effect of economic policy uncertainty on firm-level investment is greater for firms with higher firm-level uncertainty and during a recession. News-based policy shock has a significantly negative long-term effect on firms' investment. Federal expenditure forecast interquartile range shock has a significant negative effect in the short-and long-run. Policy uncertainty does not seem to influence the investment decisions of the very largest firms (about 20% of listed firms). JEL classification: E22, E61, G31

Oil price shocks and economic policy uncertainty are interrelated and influence stock market return. For the U.S. an unanticipated increase in policy uncertainty has a significant negative effect on real stock returns. A positive oil-market specific demand shock (indicating greater concern about future oil supplies) significantly raises economic policy uncertainty and reduces real stock returns. The direct effects of oil shocks on real stock returns are amplified by endogenous policy uncertainty responses. Economic policy uncertainty and oil-market specific demand shock account for 19% and 12% of the longrun variability in real stock returns, respectively. As a robustness check, (domestic) economic policy uncertainty is shown to also significantly influence real stock returns in Europe and in energy-exporting Canada.JEL classification: E44, E60, Q41, Q43

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Increases in the real price of oil not explained by changes in global oil production or by global real demand for commodities are associated with significant increases in economic policy uncertainty. Oil-market specific demand shocks account for 30% of conditional variation in economic policy uncertainty and 21.5% of conditional variation in CPI forecast interquartile range after 24 months. Positive shocks due to global real aggregate demand for commodities significantly reduce economic policy uncertainty. Structural oil price shocks appear to have long-term consequences for economic policy uncertainty, and to the extent that the latter has impact on real activity the policy connection provides an additional channel by which oil price shocks have influence on the economy. As a robustness check, structural oil price shocks are significantly associated with economic policy uncertainty in Europe and energy-exporting Canada.JEL classification: E31, E60, Q41, Q43

This paper examines the interdependence of China's policy uncertainty, the global oil market and stock market returns in China. A structural VAR model is estimated that shows that a positive shock to economic policy uncertainty in China has a delayed negative effect on global oil production, real oil prices and real stock market returns. Shocks to oil market-specific demand significantly raise China's economic policy uncertainty and reduce the real stock market returns. As measured by a spillover index, the interdependence between these variables has been rising since 2003 as China's influence in the oil market has increased. An equivalent spillover index calculated for the US is smaller and has been largely flat over time.JEL classifications: E44, G15, P40, Q43.

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Important interaction has been established for US economic policy uncertainty with a number of economic and financial variables including oil prices. This paper examines the dynamic effects of US and non-US oil production shocks on economic policy uncertainty using a structural VAR model. Such an examination is motivated by the substantial increases in US oil production in recent years with implications for US political and economic security. Positive innovations in US oil production are associated with decreases in US economic policy uncertainty. The economic forecast interquartile ranges about the US CPI and about federal/state/local government expenditures are particularly sensitive to innovations in US oil supply shocks. Shocks to US oil supply disruption causes rises in the CPI forecast uncertainty and accounts for 21% of the overall variation of the CPI forecaster disagreement. Dis-aggregation of oil production shocks into US and non-US oil production yield novel results. Oil supply shocks identified by US and non-US origins explain as much of the variation in economic policy uncertainty as structural shocks on the demand side of the oil market.JEL classification: E44, G12, Q43