Law of demand

The law of demand is a basic tenet of economics. It states that as the price of a product or service rises, demand for it falls. The reverse is also true—if the price of an item falls, demand usually rises. Demand is controlled by consumers, who decide what to buy with their money. A change in price is the only factor that will change the quantity of items demanded.

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Overview

Because consumers create a demand for goods, higher prices usually result in a lower demand. When the supply of a product increases, the price decreases, and consumers are more likely to buy. Therefore, lower prices increase demand. If demand for an item outstrips supply, creating a shortage, the price increases. At some point, demand and supply may reach equilibrium, which means they are balanced or nearly balanced.

Producers of goods and services control the quantity of what they sell based on two factors: demand and profit. Prices are based on these factors. Often, when a new product is introduced, demand is high and quantities are limited, which allows the manufacturer to charge a high price and make a significant profit. For example, when an upgrade of a smart phone becomes available, many consumers are eager to have it and will pay whatever price the manufacturer asks. Stores may quickly sell out of their supply of phones, so consumers must wait to buy one. The manufacturer may increase the quantity of the item to meet demand. After a few months, demand drops because most of the people who were willing to buy the phone at full price have done so. When demand drops, the price and the profit also decrease. Now a new group of consumers will buy the phone. Once this demand is met, the manufacturer may cut production to maintain the price or drop the price again. This process continues until the market for the new phone reaches equilibrium in which supply and demand are balanced and the manufacturer is still able to make a profit.

Of course, this is the theoretical model. In the real market, other factors influence consumers' choices and therefore demand. People looking for a smart phone have many options among manufacturers, models, and prices. But whether they are shopping for a phone, a vacation, or an ice-cream cone, consumers' choices drive demand. In addition, the general state of the economy affects whether consumers are earning enough and feeling confident enough to spend their money on gadgets, hotels, or treats. So even though the general rule is called the law of demand, other factors come into play and determine whether this law applies.

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Bibliography

Arnold, Roger A. "Supply and Demand: Theory." Macroeconomics. Mason, Oh: Cengage, 2011. Print.

Ball, Madeline K. and David Seidman. Supply and Demand. New York: Rosen, 2012. Print.

"The Law of Supply and Demand." What Is Economics? What Is Economics. Web. 9 Jul. 2014.

<http://www.whatiseconomics.org/>

Pinkasovitch, Arthur. "Introduction to Supply and Demand." Investopedia.com. Jan. 30, 2014. Web. 9 Jul. 2014.

<http://www.investopedia.com/articles/economics/11/intro-supply-demand.asp>