3.1. Estimation framework
Dumas (1978), Adler and Dumas (1984) and Hodder (1982) define economic
exposure to exchange-rate movement as the regression coefficient of the value of
the firm on the exchange rate across states of nature. However, the definition does
not imply that exchange-rate fluctuations cause changes in firms’ values. Indeed, in
Adler and Dumas, stock prices and exchange rates are both endogenous variables
and determined simultaneously. However, for an individual firm, we can safely
assume that exchange rates are exogenous.
In line with the definition above, previous research in this area 4 uses the following
model to estimate a firm’s exchange-rate exposure: