If firms in a monopolistically competitive industry are earning economic profits, then in the long run:

a. these firms can continue earning economic profits because entry into the industry is blocked.
b. new firms producing close substitutes will continue to enter the market until economic profit is zero.
c. new firms producing the exact same product will enter the industry and this entry will continue until economic profit is zero.
d. the government will most likely regulate firms in this industry to reduce the economic profits.

1. gar principles or "the principles"are intended to do what?

The larger the investment you make, the easier it will be to: get money from other sources. guarantee cash flow. buy insurance. streamline your products.

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.