In understanding and analyzing "market supply," we focus on how much all firms multiple choice are willing and able to supply at different prices. want to supply at a given price. have sold in the recent past at various prices. will supply in the future at various prices.

Are willing and able to supply at different prices.

Explanation:

Market supply refers to the total supply of goods are services in the market. It can be summarized as the total amount of goods that all individual firms in the market are able and willing to supply at different prices.

The market supply curve can be found by the horizontal summation of the individual supply curves at different prices.

Thus, the correct option is all firms are willing and able to supply at different prices.

answer(d) all of the choices are correct;