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Demand

The maximum quantities of some good that people will choose (or buy) at different prices. An identical definition is the relative value of the marginal unit of some good when different quantities of that good are available.

Demand Curve

A graphic representation of the relationship between prices and the corresponding quantities demanded per time period.

Demand Deposits

Checking accounts in commercial banks. These banks are obliged to pay out funds when depositors write checks on those numbers. Checking accounts are not cash - they are numbers recorded in banks.

Demand Site Management

An attempt by utilities to reduce customers' demand for electricity or energy by encouraging efficiency.

Demand-Pull Inflation

A term used when an increase in aggregate demand occurs which cannot be offset by a corresponding increase in real supply causing an increase in the price level (inflation).

Demographic Effects

Effects that arise from changes in characteristics of the population such as age, birthrates, and location.

Dense Fog Advisory

Issued when fog reduces visibility to 1/8 mile or less over a widespread area.

Department of Agriculture (USDA)

USDA was originally established in 1862 and raised to cabinet status in 1889. In FY1997 it had an employment level equal to about 113,000 staff years, working in some 30 separate agencies, carrying out program activities valued at $84 billion, with net federal budgetary outlays of $57 billion. Forestry, natural resource, and farm activities utilized 58% of the staff time. However, about 70% of USDA expenditures went to domestic food assistance programs. Over 90% of the staff are located in local, state, and regional field offices away from the Washington, DC, headquarters.

Dependable yield, n-years

The minimum supply of a given water development that is available on demand, with the understanding that lower yields will occur once in n years, on the average.

Depletion

The progressive withdrawal of water from surface- or ground-water reservoirs at a rate greater than that of replenishment. (see Recession curve and streamflow depletion.)

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