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Cash-in-advance constraint
The cash-in-advance constraint, also known as the Clower constraint after American economist Robert W. Clower, is an idea used in economic theory to capture monetary phenomena. In the most basic economic models (such as the Walras model or the Arrow–Debreu model) there is no role for money, as these models are not sufficiently detailed to consider how people pay for goods, other than to say everyone has a budget constraint. To be able to say anything about the money supply, inflation monetary policy and so on, economists must therefore introduce additional assumptions into their models. One possibility, and the more popular one, is to introduce a cash-in-advance constraint i.e. a requirement that each consumer or firm must have sufficient cash available before they can buy goods. An alternative assumption would be a 'Money-in-the-Utility-Function' assumption, which states that people have a tendency to hold a certain amount of cash because they derive utility from holding it. Without these (or similar) assumptions economic theory would find it difficult to explain why people carry around a good (money) which takes up space in their wallet, can't be consumed and does not earn any interest.
==Terms==
''Cash in advance'' is a term describing terms of purchase, when full payment for a good or service is due before the merchandise is shipped. This presents the least risk to a seller while having the most risk to the buyer. It is often combined with other terms such as Free On Board, which require the buyer to take possession of the merchandise as soon as it is loaded onto transportation, meaning the buyer assumes the financial risk if the shipment is lost or damaged en route. In actual daily business these sort of terms are extremely rare unless the goods or services are of phenomenal value and high fragility.
A ''constraint'' is any operating condition that puts a limit on the ability of a business to conduct its operations.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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