The amount of one currency that can be traded for a unit of another currency is called the

market share
denomination
exchange rate

The amount of one currency that can be traded for a unit of another currency is called the exchange rate.  The domestic currency  and the foreign currency, are currencies that are traded. The foreign currency is the base currency and the domestic currency is the counter currency.  Exchange rates for most major currencies are generally expressed to four places after the decimal .

be mindful of your own reaction,use positive self-talk,   and debrief.

answer; someone must cover the cost associated with the provision of scarce goods in both sectors;