Question

question 38
it is difficult for a private market to provide the economically efficient quantity of a public good because
○ individual preferences are not revealed in the market for the good.
○ public goods produce positive and negative externalities.
○ by law governments cannot use cost - benefit analysis to determine this quantity.
○ it is too expensive to produce the necessary amount of the good.

Explanation:

To solve this, we analyze each option:

1. For public goods (non - excludable, non - rivalrous), individuals have an incentive to free - ride (consume without paying), so they don't reveal their true preferences in the market. This makes it hard for private markets to determine the efficient quantity as they rely on price signals from revealed preferences.
2. Public goods typically have positive externalities (e.g., national defense benefits everyone), but the option about both positive and negative externalities is not the main reason for private market inefficiency in providing public goods.
3. Governments can use cost - benefit analysis for public goods, so this option is incorrect.
4. The issue isn't about production cost being too high, but about the free - rider problem and lack of revealed preferences.

Answer:

A. Individual preferences are not revealed in the market for the good.