**time-price differential** — A method whereby a seller charges one amount for the immediate cash payment of merchandise and another amount for the same item or items when payment is rendered at a future date or in installments. Dictionary from West s Encyclopedia of American … Law dictionary

**Price discrimination** — or price differentiation[1] exists when sales of identical goods or services are transacted at different prices from the same provider.[2] In a theoretical market with perfect information, perfect substitutes, and no transaction costs or… … Wikipedia

**Time** — This article is about the measurement. For the magazine, see Time (magazine). For other uses, see Time (disambiguation). The flow of sand in an hourglass can be used to keep track of elapsed time. It also concretely represents the present as… … Wikipedia

**Differential tariff** — is an example of demand side management where the price per unit of energy varies with time. Background There are several reasons why utilities manage demand through special programs. The utilities reaction was the introduction of demand side… … Wikipedia

**Time value of money** — The time value of money is the value of money figuring in a given amount of interest earned over a given amount of time. The time value of money is the central concept in finance theory. For example, $100 of today s money invested for one year… … Wikipedia

**Differential evolution** — In computer science, differential evolution (DE) is a method that optimizes a problem by iteratively trying to improve a candidate solution with regard to a given measure of quality. Such methods are commonly known as metaheuristics as they make… … Wikipedia

**Price elasticity of demand** — Not to be confused with Price elasticity of supply. PED is derived from the percentage change in quantity (%ΔQd) and percentage change in price (%ΔP). Price elasticity of demand (PED or Ed) is a measure used in economics to show the… … Wikipedia

**Differential geometry** — A triangle immersed in a saddle shape plane (a hyperbolic paraboloid), as well as two diverging ultraparallel lines. Differential geometry is a mathematical discipline that uses the techniques of differential and integral calculus, as well as… … Wikipedia

**Price of petroleum** — This article is about the price of crude oil. For information about derivative motor fuels, see gasoline and diesel usage and pricing. For detailed history of price movements since 2003, see 2003 to 2011 world oil market chronology. Brent barrel… … Wikipedia

**Stochastic differential equation** — A stochastic differential equation (SDE) is a differential equation in which one or more of the terms is a stochastic process, thus resulting in a solution which is itself a stochastic process. SDE are used to model diverse phenomena such as… … Wikipedia