Hello. I have questions about economic exercise. My teacher wants detailed and step-by-step solutions.

Could you give me proper answers to the following questions?

1."If it's worth doing, it's worth doing to the best of your ability." What is the economic explanation for why this statement is frequently said but rarely followed in practice? Explain.

2. If sellers of toasters were able to organize themselves, reduce their output, and raise their prices, how would economic efficiency be affected? Explain.

3. A) What are external costs? B) When are they most likely to be present? C) When external costs are present, what is likely to be the relationship between the market output of a good and the output consistent with ideal economic efficiency?