Question

benefits and costs of additional studying
what explains the reason that only one extra hour of study time is needed to increase a grade from a c to a b, but three extra hours of study time are needed to increase a grade from a b to an a?
○ the law of increasing costs
○ the law of efficiency
○ the law of under - utilization
○ the law of decreasing costs

Explanation:

The law of increasing costs (or increasing opportunity cost) states that as you increase the production (or in this case, improvement) of one good (grade improvement), the opportunity cost (here, study time/foregone free time) increases. To go from a C to a B, the opportunity cost (extra study time) is 1 hour, but to go from a B to an A, the opportunity cost rises to 3 extra hours. This matches the law of increasing costs. The other laws don't apply: law of efficiency is about optimal resource use, under - utilization is about unused resources, and decreasing costs is the opposite of what's seen here.

Answer:

A. the law of increasing costs