How does scarcity affect the economic decision of a society

Say their is a scarcity of Jordan shoes then they become high priced because of the scarcity of the product. So scarcity effects most of the economic decisions because of how less of something their is.

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.

Any answer choices that would me answer your question?