The Nature of Demand & The Nature of Supply
The Nature of Demand
Demand is
the quantity of a good or service that people are willing to buy at various
prices. The higher the price, the lower the quantity demanded, and vice versa.
A graph of this relationship is called a demand curve.
Let’s assume you own a store that sells jackets for
snowboarders. From past experience, you know how many jackets you can sell at
different prices. The demand curve in Exhibit 1.6 depicts this
information. The x-axis (horizontal axis) shows the quantity of
jackets, and the y-axis (vertical axis) shows the related price of
those jackets. For example, at a price of $100, customers will buy (demand) 600
snowboard jackets.
In the graph, the demand curve slopes downward and to the
right because as the price falls, people will want to buy more jackets. Some
people who were not going to buy a jacket will purchase one at the lower price.
Also, some snowboarders who already have a jacket will buy a
second one. The graph also shows that if you put a large number of jackets on
the market, you will have to reduce the price to sell all of them.
Understanding demand is critical to businesses. Demand tells you how
much you can sell and at what price—in other words, how
much money the firm will earn to cover costs and hopefully earn a profit.
Gauging demand is difficult even for large corporations, but particularly for
small firms.
The Nature of Supply
Demand alone is not enough to explain how the market sets
prices. We must also look at supply, the quantity of a good or
service that businesses will make available at various prices. The higher the
price, the greater the number of jackets a supplier will supply, and vice
versa. A graph of the relationship between various prices and the quantities a
business will supply is a supply curve.
We can again plot the quantity of jackets on the x-axis
and the price on the y-axis. As Exhibit 1.7 shows,
800 jackets will be available at a price of $100. Note that the supply curve
slopes upward and to the right, the opposite of the demand curve. If
snowboarders are willing to pay higher prices, suppliers of jackets will buy more
inputs (for example, Gore-Tex® fabric, dye, machinery, labour) and produce more
jackets. The quantity supplied will be greater at higher prices because
manufacturers can earn higher profits.


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