Direct provision: government directly supplying goods or services

Steps:

• Define direct provision as the government operating or taking control of services itself, unlike indirect tools like taxes or subsidies.
• Review choices: A and B involve fiscal incentives; C is price regulation; D shows government assuming control of a service.
• Eliminate A, B, C as they influence markets without direct supply.
• Confirm D matches by government directly managing the library.

Why D is correct:

• Direct provision occurs when government takes ownership or operation of a facility, as in nationalizing a library to deliver public services directly (per public economics definitions).

Why the others are wrong:

• A: Unit tax is indirect regulation to alter behavior via market prices.
• B: Subsidy is indirect financial support to private producers, not direct supply.
• C: Rent cap is price control regulation, not government providing housing.

Final answer: D