A two country inter-temporal asset pricing model is developed which im
plies that central bank foreign exchange intervention affects the forw
ard exchange risk premium. The model is estimated from daily foreign e
xchange intervention data for the US, German and Japanese central bank
s. Considerable empirical support is found for the theoretical model w
ith intervention influencing the risk premium in the forward market. P
urchases of dollars by the Federal Reserve Bank are found to be associ
ated with excess $ denominated returns. There is evidence that interve
ntion has increased rather than reduced exchange rate volatility.