Public Goods: Non-Rivalrous and Government-Provided

Steps:

• Identify key traits: government provision and non-rivalrous consumption (one person's use doesn't reduce availability for others).
• Recall good classifications: private goods are rivalrous; public goods are non-rivalrous and non-excludable.
• Match traits to public goods, often supplied publicly to address market failure.
• Eliminate options not fitting both criteria.

Why D is correct:

• Public goods are defined as non-rivalrous (consumption by one doesn't diminish supply for others) and typically provided by government due to free-rider issues.

Why the others are wrong:

• A: Complementary goods are pairs consumed together, unrelated to rivalry or government provision.
• B: Merit goods are socially beneficial but underconsumed in markets; they can be rivalrous or private.
• C: Private goods are rivalrous, where one person's consumption reduces availability for others.

Final answer: D