Flat Rate

fixed price, price that remains constant under all circumstances

A flat fee, also referred to as a flat rate or a linear rate, refers to a pricing structure that charges a single fixed fee for a service, regardless of usage. Rarely, it may refer to a rate that does not vary with usage or time of use.
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a uniform charge for media space without regard for the amount used or the number of insertions e.g time and/or quanitity discounts (see card rate). Flat Tax a system in which all levels of income are taxed at the same rate; see also progressive tax, regressive tax.

flat rate /'flæt'reit/
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flat-rate
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