Household Behavior and Consumer Choice

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Presentation transcript:

Household Behavior and Consumer Choice Chapter 6

HOUSEHOLD BEHAVIOR AND CONSUMER CHOICE

HOUSEHOLD BEHAVIOR AND CONSUMER CHOICE

HOUSEHOLD BEHAVIOR AND CONSUMER CHOICE Assumptions (1/3) perfect competition An industry structure in which there are many firms, each small relative to the industry and producing virtually identical products, and in which no firm is large enough to have any control over prices.

HOUSEHOLD BEHAVIOR AND CONSUMER CHOICE Assumptions (2/3) homogeneous products Undifferentiated outputs; products that are identical to, or indistinguishable from, one another.

HOUSEHOLD BEHAVIOR AND CONSUMER CHOICE Assumptions (3/3) perfect knowledge The assumption that households possess a knowledge of the qualities and prices of everything available in the market and that firms have all available information concerning wage rates, capital costs, and output prices.

HOUSEHOLD CHOICE IN OUTPUT MARKETS Every household must make three basic decisions: How much of each product, or output, to demand How much labor to supply How much to spend today and how much to save for the future

HOUSEHOLD CHOICE IN OUTPUT MARKETS THE DETERMINANTS OF HOUSEHOLD DEMAND Several factors influence the quantity of a given good or service demanded by a single household: The price of the product The income available to the household The household’s amount of accumulated wealth The prices of other products available to the household The household’s tastes and preferences The household’s expectations about future income, wealth, and prices

HOUSEHOLD CHOICE IN OUTPUT MARKETS THE BUDGET CONSTRAINT Information on household income and wealth, together with information on product prices, makes it possible to distinguish those combinations of goods and services that are affordable from those that are not. budget constraint The limits imposed on household choices by income, wealth, and product prices.

HOUSEHOLD CHOICE IN OUTPUT MARKETS choice set or opportunity set The set of options that is defined and limited by a budget constraint.

HOUSEHOLD CHOICE IN OUTPUT MARKETS Preferences, Tastes, Trade-Offs, and Opportunity Cost Preferences play a key role in determining demand. As long as a household faces a limited budget—and all households ultimately do—the real cost of any good or service is the value of the other goods and services that could have been purchased with the same amount of money. The real cost of a good or service is its opportunity cost, and opportunity cost is determined by relative prices.

HOUSEHOLD CHOICE IN OUTPUT MARKETS real income Set of opportunities to purchase real goods and services available to a household as determined by prices and money income.

HOUSEHOLD CHOICE IN OUTPUT MARKETS THE EQUATION OF THE BUDGET CONSTRAINT In general, the budget constraint can be written: where PX = the price of X, X = the quantity of X consumed, PY = the price of Y, Y = the quantity of Y consumed, and I = household income. PXX + PYY = I,

HOUSEHOLD CHOICE IN OUTPUT MARKETS The budget constraint is defined by income, wealth, and prices. Within those limits, households are free to choose, and the household’s ultimate choice depends on its own likes and dislikes.

THE BASIS OF CHOICE: UTILITY utility The satisfaction, or reward, a product yields relative to its alternatives. The basis of choice.

THE BASIS OF CHOICE: UTILITY DIMINISHING MARGINAL UTILITY marginal utility (MU) The additional satisfaction gained by the consumption or use of one more unit of something. total utility The total amount of satisfaction obtained from consumption of a good or service. law of diminishing marginal utility The more of any one good consumed in a given period, the less satisfaction (utility) generated by consuming each additional (marginal) unit of the same good.

THE BASIS OF CHOICE: UTILITY THE UTILITY-MAXIMIZING RULE In general, utility-maximizing consumers spread out their expenditures until the following condition holds:

INCOME AND SUBSTITUTION EFFECTS THE INCOME EFFECT When the price of something we buy falls, we are better off. When the price of something we buy rises, we are worse off.

INCOME AND SUBSTITUTION EFFECTS THE SUBSTITUTION EFFECT Both the income and the substitution effects imply a negative relationship between price and quantity demanded—in other words, downward-sloping demand. When the price of something falls, ceteris paribus, we are better off, and we are likely to buy more of that good and other goods (income effect). Because lower price also means “less expensive relative to substitutes,” we are likely to buy more of the good (substitution effect). When the price of something rises, we are worse off, and we will buy less of it (income effect). Higher price also means “more expensive relative to substitutes,” and we are likely to buy less of it and more of other goods (substitution effect).

CONSUMER SURPLUS consumer surplus The difference between the maximum amount a person is willing to pay for a good and its current market price. diamond/water paradox A paradox stating that (1) the things with the greatest value in use frequently have little or no value in exchange, and (2) the things with the greatest value in exchange frequently have little or no value in use.

HOUSEHOLD CHOICE IN INPUT MARKETS THE LABOR SUPPLY DECISION As in output markets, households face constrained choices in input markets. They must decide Whether to work How much to work What kind of a job to work at In essence, household members must decide how much labor to supply. The choices they make are affected by Availability of jobs Market wage rates Skills they possess

HOUSEHOLD CHOICE IN INPUT MARKETS THE PRICE OF LEISURE The wage rate can be thought of as the price—or the opportunity cost—of the benefits of either unpaid work or leisure. Trading off one good for another involves buying less of one and more of another, so households simply reallocate money from one good to the other. “Buying” more leisure, however, means reallocating time between work and non-work activities. For each hour of leisure that I decide to consume, I give up one hour’s wages. Thus the wage rate is the price of leisure.

HOUSEHOLD CHOICE IN INPUT MARKETS INCOME AND SUBSTITUTION EFFECTS OF A WAGE CHANGE labor supply curve A diagram that shows the quantity of labor supplied at different wage rates. Its shape depends on how households react to changes in the wage rate.