After swimming 100 laps at the pool, Erik decides to swim 10 more before lifting weights. This statement best represents this economic concept:
A)Resources are scarce.
B)The real cost of something is what you must give up to get it.
C)"How much" is a decision at the margin.
D)There are gains from trade.

Question

Quizplus · Accepted Answer

The decision to swim 10 more laps before shifting to weights represents a decision at the margin, as Erik is making a choice about how much more of the activity to engage in. He is not making a decision about whether or not to swim or lift weights, which would relate to the scarcity of resources or gains from trade. The real cost of his decision is not explicitly mentioned in the statement.

After Swimming 100 Laps at the Pool, Erik Decides to Swim