Text 7 Utility and Prices

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Text 7 Utility and Prices

Our basic needs are simple, but our additional individual wants are often very complex. Commodities of different kinds satisfy our wants in different ways. A banana, a bottle of medicine and a textbook satisfy very different wants. The banana cannot satisfy the same wants as the textbook.

This characteristic of satisfying a want is known in economics as its `utility'. Utility, however, should not be confused with usefulness. For example, a submarine may or may not be useful in time of peace, but it satisfies a want. Many nations want submarines. Economists say that utility determines 'the relationship between a consumer and a commodity'.

Utility varies between different people and between different nations. A vegetarian does not want meat, but may rate the utility of bananas very highly, while a meat-eater may prefer steak. A mountain-republic like Switzerland has little interest in submarines, while maritime nations rate them highly.

Utility varies not only in relation to individual tastes and to geography, but also in relation to time. In wartime, the utility of bombs is high, and the utility of pianos is low. Utility is therefore related to our decisions about priorities in production – particularly in a centrally-planned economy. The production of pianos falls sharply in wartime.

The utility of a commodity is also related to the quantity which is available to the consumer. If paper is freely available, people will not be so interested in buying too much of it. If there is an excess of paper, the relative demand for paper will go down. We say that the utility of a commodity therefore decreases as the consumer's stock of that commodity increases.

In most economic systems, the prices of the majority of goods and services do not change over short periods of time. In some systems it is of course possible for an individual to bargain over prices, because they are not fixed in advance. In general terms, however, the individual cannot change the prices of the commodities he wants. When planning his expenditure, he must therefore accept these fixed prices. He must also pay this same fixed price no matter how many units he buys. A consumer will go on buying bananas for as long as he continues to be satisfied. If he buys more, he shows that his satisfaction is still greater than his dislike of losing money. With each successive purchase, however, his satisfaction compensates less for the loss of money.

A point in time comes when the financial sacrifice is greater than the satisfaction of eating bananas. The consumer will therefore stop buying bananas at the current price. The bananas are unchanged; they are no better or worse than before. Their marginal utility to the consumer has, however, changed. If the price had been higher, he might have bought fewer bananas; if the price had been lower, he might have bought more.

It is clear from this argument that the nature of a commodity remains the same, but its utility changes. This change indicates that a special relationship exists between goods and services on the one hand, and a consumer and his money on the other hand. The consumer's desire for a commodity tends to diminish as he buys more units of that commodity. Economists call this tendency the Law of Diminishing Marginal Utility.

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