Comments welcome Politics and Volatility*

We investigate how politics (party orientation, national elections, and strength of democratic institutions) affect stock market volatility. We hypothesize that labor-intensive industries, industries with larger exposure to foreign trade, industries whose operations require efficient contracts, and industries susceptible to government expropriation are more sensitive to changes in political environment. Using a large panel of industry-country-year observations, we show that politically-sensitive industries exhibit higher volatilities during national elections. Volatility is also higher for labor-intensive industries under leftist governments. Moreover, governance-sensitive industries and industries under a higher risk of expropriation are more volatile when democratic institutions are weak. The rise in volatility is driven largely by systematic risk rather than firm-specific risk. The results are consistent with the ‘peso problem ’ hypothesis that uncertainty about future government policies can increas