How Demand and Supply Interact to Determine Prices
How Demand and Supply Interact to Determine Prices
In a stable economy, the number of jackets that snowboarders
demand depends on the jackets’ price. Likewise, the number of jackets that
suppliers provide depends on price. But at what price will consumer demand for
jackets match the quantity suppliers will produce?
To answer this question, we need to look at what happens
when demand and supply interact. By plotting both the demand curve and the
supply curve on the same graph in Exhibit 1.8, we see that they
cross at a certain quantity and price. At that point, labeled E, the quantity
demanded equals the quantity supplied. This is the point of equilibrium.
The equilibrium price is $80 and the equilibrium quantity is 700 jackets. At
that point, there is a balance between the quantity consumers will buy and the
quantity suppliers will make available.
Market equilibrium is achieved through a series of quantity
and price adjustments that occur automatically. If the price increases to $160,
suppliers produce more jackets than consumers are willing to buy, resulting in
a surplus. To sell more jackets, prices will have to fall. Thus, a surplus
pushes prices downward until equilibrium is reached. When the price falls to
$60, the quantity of jackets demanded rises above the available supply. The
resulting shortage forces prices upward until equilibrium is reached at $80.


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