A distortion is a condition that creates economic inefficiency, thus interfering with economic agents maximizing "social welfare" when they maximize their own welfare.

Distortion (economics),

In the idealized conditions of perfect competition with no externalities, there is zero distortion at market equilibrium of supply and demand where price equals marginal cost for each firm and product. More generally, a condition used to measure distortion is the deviation between the market price of a good and its marginal social cost, that is, the difference between the marginal rate of substitution in consumption and the marginal rate of transformation in production. Such a deviation may result from government regulation, monopoly, tariffs and import quotas, which in theory may give rise to a certain kind of behavior called rent seeking. Other sources of distortions are uncorrected externalities, different tax rates on goods or income, inflation, and incomplete information. Each of these may lead to a net loss in social surplus.

See also

LendingTree ,

Disability ,

Asset-backed security ,

Lump-sum ,

Life annuity ,

In actuarial science, the actuarial present value ... ,

Structured Settlements in the United States,

(source:wikipedia)