The additional cost a firm will incur by producing one additional unit of output is the:

Market demand curves are obtained by

A) observing the behavior of an individual consumer in a market. B) observing the prices and quantities sold in a market over time and plotting those price-quantity combinations in a graph. C) averaging the quantities every consumer is willing to buy at each different price. D) summing the quantities every consumer is willing to buy at each different price. E) determining the price each consumer is willing to pay for the good and summing those prices across all consumers.

The labor force consists of all adults who are currently employed

a. True b. False Indicate whether the statement is true or false