In the long run, both monopolistic competition and competitive markets result in: a) a wide variety of brand-name choices for consumers. b) an inefficient allocation of resources. c) zero economic profit for firms. d) excess capacity. e)insufficient capacity.

c) zero economic profit for firms.

Explanation:

In both cases, while there is room for economic gain, market structures - perfect competition and monopolistic competition - will attract entrants to compete. In the long run, the market goes into balance when economic profit is zero.

Recalling that the concept of economic profit is different from accounting profit.

Yes, the cost in dollars and the amount of yogurt are proportional.

The equation is:

Step-by-step explanation:

1. If varies directly as , you can write it as following:

Where is the constant of proportionality.

2. Let's calculate the value of the constant of proportionality. If and , you have:

3. Then, the equation is:

4. Let's verify if they are directly proportional. Substitute which is the amount of yogurt bought by Jonah. The result must be $0,48:

5. They are directly proportional.