First, we used the formula for the value of a forward contract to identify the three risk factors. This is the essential mapping idea: we characterize the portfolio as a set of exposures to underlying risk factors. In this case, a forward currency contract maps to a long position in a foreign currency spot rate, a long position in a foreign interest rate (EUR bill) and a short position in a domestic interest rate (USD bill).
Second, we develop input assumptions: VaR for the risk factors and the correlation matrix. Third, we use the formula for portfolio VaR: post-multiply R(xV) and then pre-multiply (xV)’R(xV).
This video is developed by David from Bionic Turtle.