8.1 Government policies to achieve efficient resource allocation and correct market failure

Governments may address market failure with taxes, subsidies, regulation, tradable permits, direct provision, information, competition policy or assignment of property rights.

Choose the instrument by asking what is missing: a tax can internalise a cost, a subsidy can encourage an external benefit, information can reduce asymmetric knowledge, and competition policy can limit market power. Estimate implementation and enforcement costs.

A pollution tax aims to move private cost toward social cost; if emissions are difficult to monitor, a standard or permit system may be more practical than a perfectly calibrated tax.

“Government intervention” is not a cure by definition: policy can overshoot, be captured or cost more than the welfare gain.

Government failure occurs when intervention creates a larger welfare loss than the market problem it was intended to correct, or fails to improve the outcome at reasonable cost.

Causes include imperfect information, administrative cost, unintended incentives, regulatory capture, political short-termism, rent-seeking and weak enforcement. Compare the policy outcome with the realistic counterfactual, not with a perfect textbook market.

A subsidy intended to reduce pollution may increase output if it is poorly targeted, while a regulation that is cheap to comply with may deliver little environmental benefit because firms can evade it.

Government failure does not prove markets are always efficient; both the original market failure and the feasible intervention must be assessed.