(consider this) if the law of diminishing returns applies to study time:

a. the 10thhour of study will likely be less productive than the 3rd.
b. this implies that longer lectures are less productive than shorter ones.
c. there is no benefit to studying a subject more than 5 hours in any given day.
d. people with less intelligence necessarily experience diminishing returns sooner than those with greater intelligence

Self-interest achieve society’s economic goals because producers know which goods consumers want the most. as consumers and producers exercise their freedom to act in their own self-interest, markets will produce the desired goods at the lowest possible cost. consumers and producers both operate based on society’s economic goals. consumers know which goods can be produced at the lowest cost. there is a wide variety of desired goods and services in a market system because producers determine what to produce. consumers change their minds frequently. there is always a need to produce something new and improved. individual wants are diverse. what is produced is ultimately determined by consumers, because if the goods offered are not what consumers want, consumers will not buy them. producers, because they are driven by profits. producers, because they determine what to produce. consumers, because they participate in marketing surveys.