Assuming other foreign exchange traders face the same exchange rates you do$,$ they will buy dollars in$$and sell them in$.$ As a result, the dollar$-$per$-$euro exchange rate in Frankfurt $($E$$/$EURFRE$$/$EURFR$)$ will$,$ and the dollar$-$per$-$euro exchange rate in Boston $($E$$/$EURBOE$$/$EURBO$)$ will$.$