Marketing research firms that collect certain information on a regular basis, which they then sell to interested clients, are involved in what kind of research?

This one hard but um i have no idea i’m sorry

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.