Q.What is meant by 'market failure' in the context of the environment? Explain with the help of the concept of a negative externality.

Markets usually allocate resources efficiently, but environmental problems are a textbook case of where that mechanism breaks down.

Market failure, in the environmental context, refers to a situation where the market mechanism — prices set by private buyers and sellers — fails to allocate resources efficiently because the private cost a producer bears is lower than the full social cost that its activity actually imposes on society.

Negative externality is the specific concept that explains why this happens: it is an uncompensated cost of an economic activity that falls on a third party — someone who is neither the buyer nor the seller in the original transaction.

Worked example: consider a factory that discharges untreated effluent into a river. The factory's private cost of production includes only its raw materials, labour and capital — it does not include the harm the pollution causes to downstream villages: contaminated drinking water, damage to fishing livelihoods, and health costs borne by residents who were never party to the factory's transactions. Because the factory's own decision-making never has to account for this external cost, it has no market-driven incentive to reduce pollution or install treatment facilities. The result: the market, left to itself, leads the factory to produce more pollution (and more output) than would be socially optimal if the full cost were actually accounted for. …

Explaining 'externality' only in the abstract without tying it to a concrete example of who bears the uncompensated cost — the whole point of the concept is identifying the …