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The need or desire for a good, service, or asset among consumers at a given price. The amount of demand at a given price is determined by supply and the availability of similar or replacements goods and services, among other factors. While demand for some staple products is relatively constant regardless of price, most of the time the price has a large influence on the level of demand. Demand for a good or service tends to increase as its price decreases. See also: Law of supply and demand, Demand curve.


the amount of a product which is purchased at a particular price at a particular point in time. A demand curve is a line showing the relationship between the price of a product and the quantity demanded per time period over a range of possible prices. Demand curves are usually downward sloping, indicating that as the price of the product falls, more is demanded. The extent to which the demand for a product will increase as price falls (and the extent to which demand will drop if the price rises) depends on the product's price-ELASTICITY OF DEMAND. The demand for a product, however, is determined also by a variety of non-price factors. A demand function attempts to incorporate all the factors that have a statistically. significant influence on demand for example, consumers' incomes, the prices of substitute products, advertising, etc. Demand curves will shift if any of these factors change over time.

In practice, firms are unable to derive definitive demand curves because of incomplete information. For this reason many firms use a COST-BASED PRICING formula for determining prices, but allow for the influence of demand by varying the profit mark-up (see DEMAND-BASED PRICING, COMPETITION-BASED PRICING).

There are various methods a firm can use to ‘forecast’ demand, including time series analysis, barometric indicators and econometric models. See SALES FORECASTING.



effective demand

the WANT, need or desire for a product backed by the money to purchase it. In economic analysis, demand is always based on ‘willingness and ability to pay’ for a product, not merely want or need for the product. CONSUMERS’ total demand for a product is reflected in the DEMAND CURVE. Compare SUPPLY.
References in periodicals archive ?
Specifically, strength training and prosthetic training have both been found to decrease metabolic demand [17,29].
The purpose of this study was to assess the physiological and metabolic demands of a rescue simulation in a surf beach and identify the performance determinants.
* Propofol anaesthesia is being utilised in adults to reduce the metabolic demand for oxygen, with the added benefit of improving the seizure threshold.
Hypothermia: Cooling the brain reduces damage by decreasing metabolic demand, decreasing inflammation and reducing the release of glutamate and free radicals that compound ischaemic damage.
Barbiturate therapy is thought to decrease elevated ICP by inducing vasoconstriction and decreasing cerebral metabolic demand (Bullock et al., 2000; MICROMEDEX, 2002).
fulgens, the energy available from the presumed 100% catabolism of energy reserves was more than adequate to support metabolic demand. This is in contrast to previous studies with other species of abalone larvae (H.
Differences in feeding activity between the sexes may be a consequence of metabolic demands and, therefore, an outcome of sexual segregation rather than its cause.
Therefore, using HR-based methods should allow coaches and players alike to better understand and estimate the metabolic demands during professional rugby union games
(14) compared blood lactate and rating of perceived exertion (RPE) from MMA official matches to three different training sessions, including sparring bouts, and concluded that these training sessions successfully replicated the metabolic demands, specifically lactate concentrations, of the competitive environment.
[W.sub.AER]: aerobic energy system contribution; [W.sub.GLYCOL]: glycolytic energy system contribution; [W.sub.TOTAL]: total metabolic demand; RCP: respiratory compensation point; PTS: peak treadmill speed; [??][O.sub.2max]: maximal oxygen uptake; T10-km time: total time to complete 10-km running time trial.
It is not directly clear from the present study if the differences in metabolic demand are also associated with concomitant increases in RPE.
Results from this study showed that metabolic demand for servicemembers with amputations was 8.5 percent and 10.4 percent higher than that for the controls at speeds of 1.34 m/s and 1.52 m/s, respectively.

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