What does constituencies mean in politics?

A constituency is a designated geographical district. People within one constituency can vote to elect a representative to represent their constituency. Small/local constituencies might manage mayors and governors, while large/regional/state-wide constituencies might elect representatives to Congress or the Senate.

Currently, as of february 2016, an american traveling in france would be by the exchange rate. the weakness of the euro and the strength of the us dollar means that items in france cost less to an american than they otherwise would. of course, if this trend reverses and the us dollar weakens and the euro strengthens, such as was happening in early 2008, an american traveling in france would have an adverse experience because items would cost relatively more.