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28. What is demand?

Most people think of demand as being the desire for a certain economic product. That desire must be coupled with1 the ability and willingness to pay. Effective demand, that is desire plus ability and willingness to pay, influences and helps to determine prices.

In economic theory, demand means the amount of a commodity or service that economic units are willing to buy, or actually buy, at a given price. In economic theory, therefore, demand is always effective demand, i.e., demand, supported by purchasing power, and not merely the desire for a particular commodity or service.

In economics the relationship of demand and price is expressed by the Law of Demand. It says that the demand for an economic product varies inversely with its price. In other words, if prices are high the quantities demanded will be low. If prices are low the quantities demanded will be high.

29. How do prices affect the quantities demanded?

In economics the relationship of demand and price is expressed by the Law of Demand. It says that the demand for an economic product varies inversely with its price. In other words, if prices are high the quantities demanded will be low. If prices are low the quantities demanded will be high.

The demand for some products is such that consumers do care about changes in price when they buy a great many more units of product because of a relatively small reduction in price. The demand for the product is said to be elastic.

For other products the demand is largely inelastic. This means that a change in price causes only a small change in the quantity demanded.

A higher or lower price for salt, for example, probably will not bring about much change in the quantity bought because people can consume just so much salt.

30. What factors is demand influenced by?

Demand is influenced by price. In economics the relationship of demand and price is expressed by the Law of Demand. It says that the demand for an economic product varies inversely with its price. In other words, if prices are high the quantities demanded will be low. If prices are low the quantities demanded will be high.

Demand is not only influenced by price, but also by many other factors, such as the incomes of the demanders and the prices of substitutes. In economic analysis, these other factors are frequently assumed to be constant. This allows one to relate a range of prices to the quantities demanded in what is called the demand function and to graph this relationship in the demand curve.

The demand curve is the graphical representation of the demand function. It tells us how many units of a particular commodity or service would be bought at various prices, assuming that all other factors remain unchanged.

31. What is supply?

Business people think of demand as the consumption of goods and services. At the same time, they think of supply as their production. As they see it, supply means the quantity of a product supplied at the price prevailed at the time. In economic theory, the term «supply» denotes the amount of a commodity or service offered for sale at a given price. Economists want to know how much of a certain product sellers will supply at each and every possible market price. Supply may be defined as a schedule of quantities that would be offered for sale at all of the possible prices that might prevail in the market. Everyone who offers an economic product for sale is a supplier.

The law of supply states that the quantity of an economic product offered for sale varies directly with its price. If prices are high suppliers will offer greater quantities for sale. If prices are low, they will offer smaller quantities for sale.

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