The slope of the production possibility frontier is determined by the of expanding production of one good, measured by how much of the other good would be lost.

The correct answer is the opportunity cost of producing a good.

Explanation:

The production possibility curve or frontier shows all the different bundles of two goods that can be produced using the given resources.

The opportunity cost of a good is the amount of other good sacrificed to produce this one.

The slope of production possibility curve represents the opportunity cost of producing a good.

the answer is     d. in our global economy, most job growth will be in services, but manufacturing jobs will exist, too.