Political sentiment and predictable returns

This study shows that shifts in political climate influence stock prices. As the party in power changes, there are systematic changes in the industry-level composition of investor portfolios, which weaken arbitrage forces and generate predictable patterns in industry returns. A trading strategy that attempts to exploit demand-based return predictability generates an annualized risk-adjusted performance of 6% during the 1939 to 2011 period. This evidence of predictability spans 17%-27% of the market and is stronger during periods of political transition. Our demand-based predictability pattern is distinct from cash flow-based predictability identified in the recent literature.