Government failure occurs when government intervention proves to be unwarrented, either because markets are performing adequetely or public policy does not correct a market failure efficiently.
Government intervention could exacerbate a problem/produce unintended negative results making the cost of government failure > cost of market failure.
Cost of intervention:
Subsidies add to government spending
Administrative costs
Imperfect information
Distortion of incentives
Political agenda
Benefits of intervention:
Correction / Reduction of market failure
Since government failure may result in missed opportunities and wasted resources, market failure must be balanced against government failure.