EFF/KRF: Government intervention affects the market in two ways. First, it affects the level of expected future profitability, which has direct effects on stock prices. Second, government intervention and uncertainty about the government's future actions change the risk of expected future profits, which affects stock prices by raising or lowering the discount rates for expected future profits, and thus raising or lowering expected stock returns. Our view is that the rhetoric and sweeping initiatives of the new administration have lowered market expectations of future profitability, and the uncertainty about government policies has increased the risk of expected future profits. Both effects have contributed to the lower stock prices we have seen as the policies of the new administration have unfolded. If the market has it right (that is, if the market is efficient) all this is built into current stock prices, and expected returns are higher going forward. (See also the answers to Expected Return and Stimulus Efforts, Hedging Inflation with Bonds.)
Eugene Fama and Ken French are members of the Board of Directors for and provide consulting services to Dimensional Fund Advisors LP.