Suppose a market is in equilibrium. the area between the demand curve and the market price is:

Equilibrium- simply mean a market that has equal supply and demands.

The demand curve and market price is levelled- off which means they are equivalent. The quantity/ supply of product is equal to customer's demand.
For example: orange value (5.00) for supply equals demand an orange costs (5.00) to pay for.

Hope this helps.

Answerone player's optimal action choice taking the other player's action as given;

Manufacturing in the us is more expensive. due to labor costs & the cost of importing materials.