In pricing of forward on currencies, why do we do spot exchange rate discounted at the foreign interest rate - forward rate discounted at the domestic interest rate.
I am confused as to which interest rates are used where?
This is saying that if you start with one unit of the domestic, convert it to foreign, earn the foreign return, and forward convert it back tot he domestic currency, it should equal the domestic return.
I understand that part but I am still not clear as to why we foreign interest rate to discount the spot exchange rate and domestic interest rate to discount the forward rate?