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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