In its simplest form, this involves exchanging principal and interest payments in one currency for principal and interest payments in another. A currency swap agreement requires the principal to be speciﬁed in each of the two currencies. The principal amounts are usually exchanged at the beginning and at the end of the life of the swap. Usually the principal amounts are chosen to be approximately equivalent using the exchange rate at the swap’s initiation. When they are exchanged at the end of the life of the swap, their values may be quite diﬀerent.