Paradox

A paradox is a statement or group of statements that leads to a contradiction or a situation which (if true) defies logic or reason, similar to circular reasoning. Typically, however, quoted paradoxical statements do not imply a real contradiction and the puzzling results can be rectified by demonstrating that one or more of the premises themselves are not really true, a play on words, faulty and/or cannot all be true together. But many paradoxes, such as Curry's paradox, do not yet have universally accepted resolutions. The word paradox is often used interchangeably with contradiction. Literary and other artistic uses of paradoxes imply no contradiction and may be used to describe situations that are ironic. Sometimes the term paradox is used for situations that are merely surprising. An example of a paradox is "This statement is false.", and is explained below.

The logician Willard V. O. Quine distinguishes:

• Falsidical paradoxes, which are seemingly valid, logical demonstrations of absurdities
• Veridical paradoxes, such as the birthday paradox or the Monty Hall paradox, which are seeming absurdities that are nevertheless true because they are perfectly logical.

Paradoxes in economics tend to be the veridical type, typically counterintuitive outcomes of economic theory, such as Simpson's paradox. In literature a paradox can be any contradictory or obviously untrue statement, which resolves itself upon later inspection.