求解器。。

问题如下：

Are principal payments exchanged in (a) interest rate swaps and (b) currency swaps?

解释：

Principal payments are not exchanged in an interest rate swap (exchanging principals would not, of course, make any difference when the principals used to determine interest payments on both sides of the swap are the same). Principal payments are exchanged in a currency swap (there are two different principals, one for each currency).