Economists
use the model of supply and demand to analyse competitive
markets. In a competitive market, there are many buyers and
sellers, each of whom has little or no Influence on the
market price.
The supply curve shows how the quantity of a good supplied depends on
the price. According to the law of supply, as the price of a
good rises, the quantity supplied rises. Therefore, the supply curve slopes upward.
In addition to price, other determinants of how much producers
want to sell include input prices, technology, expectations,
the number of sellers, and natural and social factors. If one of these
factors changes, the supply curve shifts.
The demand curve shows how the quantity of a good demanded
depends on the price. According to the law of demand, as the price of a good falls, the
quantity demanded rises. Therefore, the demand curve slopes downward.
In addition to price, other determinants of how much consumers
want to buy include income, the prices of substitutes and
complements, tastes, expectations and the number of buyers. If
one of these factors changes, the demand curve shifts.
The intersection of the supply and demand curves determines the
market equilibrium. At the equilibrium price, the quantity
supplied equals the quantity demanded.
The behaviour of sellers and buyers naturally drives markets toward their
equilibrium. When the market price is above the equilibrium
price, there is a surplus of the good, which causes the market
price to fall. When the market price is below the equilibrium price, there is a shortage,
which causes the market price to rise.
To analyse how any event influences a market, we use the supply and
demand diagram to examine how the event affects the equilibrium price and quantity. To
do this we follow three steps. First, we decide whether the event shifts the
supply curve or the demand curve (or both). Secondly, we decide which direction the
curve shifts. Thirdly, we compare the new equilibrium
with the initial equilibrium.
In market economies, prices are the signals that guide economic
decisions and thereby allocate scarce resources. For every good
in the economy, the price ensures that supply and demand
are in balance. The equilibrium price then determines
how much of the good buyers choose to purchase and how much sellers choose
to produce.
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