The student center on campus has burritos, bagels, or burgers for lunch, and they all cost
the same. You love burgers and bagels, but you decide to have a burger today. If they
were out of burgers, you would have bought a bagel. This statement best represents this
economic concept:-
A) The real cost of something is what you must give up to get it.
B) "How much" is a decision at the margin.
C) Resources are used to produce something else.
D) There are gains from trade.

Option A

Explanation:

Option A is correct because the real value of the an economic good is the opportunity cost that you have paid to acquire the economic good. So in this case, the real value of the bagel is the entertainment lost due to absence of the burger and the monetary value that you have paid to acquire the product. So the option A best represents the economic concept of scarce relation with the economic goods.

fractionally backed paper money

fiat money

paper money

metallic money