In order to calculate marginal cost, producers must compare the difference in the cost of producing one unit to the cost of

1.purchasing a unit.
2.distributing that unit.
3.producing the next unit.
4.producing a different unit.

answer: 3

Explanation:

a. because the u.s. was the leading with the most technology, economy, etc. also was teamed with other allies witch boosted the economy and materials to improve technology and use it.

answer: 25.8 years old or 25 years old