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Determinants Of The Market Demand Curve Economics Essay

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3-1 Explain the law of demand. Why does a demand curve slope downward? How is a market demand curve derived from individual demand curves?

As prices change because of a change in supply for a commodity, buyers will change the quantity they demand of that item. If the price drops, a larger quantity will be demanded. If the price rises, a lesser quantity will be demanded.

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The demand curve slopes downward because of diminishing marginal utility, and the substitution and income effects. Because successive units of a good provide less additional utility than the previous units, buyers will only pay for these smaller amounts of utility if the price is lowered. When the price of a commodity decreases relative to that of substitutes, a buyer will substitute the now cheaper commodity for those whose prices have not changed. At the same time, the decreased price of the commodity under discussion will make the buyer wealthier in real terms. More can be bought of this commodity (as well as of others whose prices have not changed). Thus, the substitution and income effects reinforce each other: More will be bought of a normal (or superior) commodity as its price decreases. On a graph with price on the vertical axis and quantity on the horizontal, this is shown as a demand curve sloping downward from left to right.

The market demand curve is derived by horizontally summing the individual demand curves.

3-2 What are the determinants of demand? What happens to the demand curve when each of these determinants changes? Distinguish between a change in demand and a change in the quantity demanded, noting the cause(s) of each.

The fundamental determinant of demand is the price of the commodity under consideration: a change in price causes movement along the commodity’s demand curve. This movement is called a change in quantity demanded. Decreased price leads to movement down the demand curve: There is an increase in quantity demanded. Increased price leads to movement up the demand curve: There is a decrease in quantity demanded.

In addition, there are determinants of demand, which are factors that may shift the demand curve, i.e., cause a “change in demand.” These are the number of buyers, the tastes (or desire) of the buyers for the commodity, the income of the buyers, the changes in price of related commodities (substitutes and complements), and expectations of the buyers regarding the future price of the commodity under discussion.

The following will lead to increased demand: more buyers, greater desire for the commodity, higher incomes (assuming a normal good), lower incomes (assuming an inferior good), an increased price of substitutes, a decreased price of complements, and an expectation of higher future prices or incomes. This increased demand will show as a shift of the entire demand curve to the right.

The reverse of all the above will lead to decreased demand and will show as a shift of the entire demand curve to the left.

3-3 (Key Question) What effect will each of the following have on the demand for small automobiles such as the Mini Cooper and Smart car?

a. Small automobiles become more fashionable.

b. The price of large automobiles rises (with the price of small autos remaining the same).

c. Income declines and small autos are an inferior good.

d. Consumers anticipate the price of small autos will greatly come down in the near future.

e. The price of gasoline substantially drops.

Demand increases in (a), (b), and (c); decreases in (d). The last one (e) is ambiguous. As autos and gas are complements, one could argue that the decrease in gas prices would stimulate demand for all cars, including small ones. However, one could also argue that small cars are attractive to consumers because of fuel efficiency, and that a decrease in gas prices effectively reduces the price of the “gas guzzling” substitutes. That would encourage consumers to switch from smaller to larger cars (SUVs), and demand for small automobiles would fall. [This presents a good illustration of the complexity of many of these changes.]

3-5 What are the determinants of supply? What happens to the supply curve when each of these determinants changes? Distinguish between a change in supply and a change in the quantity supplied, noting the cause(s) of each.

The fundamental determinant of supply is the price of the commodity. As price increases, the quantity supplied increases. An increase in price causes a movement up a given supply curve. A decrease in price causes a movement down a given supply curve.

The non-price determinants of supply are: resource (input) prices, technology, taxes and subsidies, prices of other related goods, expectations, and the number of sellers. If one or more of these change, there will be a change in supply and the whole supply curve will shift to the right or the left.

The following will cause an increase in supply: a decrease in resource (input) prices; improved (lower cost) technology; a decrease in business taxes, an increase in subsidies to business; a decrease in the price of another commodity that this firm was making, provided that commodity is a substitute in production (the firm can switch from the now lower priced one to our commodity); an expectation of lower prices in the future; and an increase in the number of sellers. The increase in supply caused by the noted change in one or more of the above will cause the entire supply curve to shift to the right. More will now be supplied at any given price. Alternatively expressed, any given amount will now be supplied at a lower price.

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The reverse of any or all the above changes in the determinants of demand will cause a decrease in demand and will be shown as a shift of the supply curve to the left. Less will now be supplied at any given price. Alternatively expressed, any given amount will now be supplied at a higher price.

3-6 (Key Question) What effect will each of the following have on the supply of automobile tires?

a. A technological advance in the methods of producing tires.

b. A decline in the number of firms in the tire industry.

c. An increase in the price of rubber used in the production of tires.

d. The expectation that the equilibrium price of auto tires will be lower in the future than it is currently.

e. A decline in the price of large tires used for semi-trucks and earth hauling rigs (with no change in the price of auto tires).

f. The levying of a per-unit tax in each auto tire sold.

g. The granting of a 50-cent-per-unit subsidy for each auto tire produced.

Supply increases in (a), (d), (e), and (g); decreases in (b), (c), and (f).

3-7 “In the corn market, demand often exceeds supply and supply sometimes exceeds demand.” “The price of corn rises and falls in response to changes in supply and demand.” In which of these two statements are the terms “supply” and “demand” used correctly? Explain.

In the first statement “supply” and “demand” are used incorrectly. Supply and demand are both schedules or curves that intersect where quantity supplied and quantity demanded are equal. One cannot talk of curves that intersect as exceeding or not exceeding each other.

Supply and/or demand can change (the entire curves can shift). Each time this happens, it will create a new intersection of the two curves that will lead to changes in the equilibrium quantity and price of corn. Thus, the terms “supply” and “demand” are used correctly in the second statement.

3-10 In 2001 an outbreak of foot-and-mouth disease in Europe led to the burning of millions of cattle carcasses. What impact do you think this had on the supply of cattle hides, hide prices, the supply of leather goods, and the price of leather goods?

The supply of cattle hides was reduced, raising the price of hides. Because hides were more expensive, it became more costly to produce leather, reducing the supply and raising the price of leather goods

3-15 What do economists mean when they say that “price floors and ceilings stifle the rationing function of prices and distort resource allocation”?

When unrestrained, prices rise and fall to correct imbalances between the quantity supplied and quantity demanded in a market. If sellers find themselves at a given price with more output than consumers are willing to purchase, the price will fall. Likewise, if the market is not offering enough of a good to satisfy consumer demand, the price will rise. Price floors and ceilings prevent price movements to correct these imbalances. When a price is set above equilibrium (i.e. a price floor), sellers will produce more than the market can support, diverting resources away from more highly valued uses. Price ceilings result in an underallocation of resources toward a particular good, where the excess demand (shortage) reveals that consumers value the good (and therefore the resources used to produce it) more than what the market currently offers.


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