Download A change in the price of a good results in a change in the quantity

Analyzing Shifts in the Demand Curve
A change in the price of a good results in a change in the quantity
demanded and is shown by a movement along the demand curve.
A change in one of the other variables that are usually held constant results
in consumers demanding more of the good at every price. This change in
demand is represented as a shift in the demand curve.
Recall that an increase in the price of
bread means that consumers buy fewer
loaves of bread, holding all other
variables held constant. According to
the law of demand, the price of a
good and the quantity demanded have
an inverse relationship. The change
in quantity demanded that results
from a change in price is represented
by a movement along the demand
curve, as shown on the left. The
demand curve never shifts when there
is a change in one of the variables
measured on the axes.
If one of the previously constant
variables changes (in this case,
income), we have to construct a new
demand schedule and curve. In this
example, household income has
increased. Such an increase means
that the consumer will purchase more
bread at every possible price.
This phenomenon is called a change
in demand and is shown by an
outward shift in the demand curve.
The new demand curve is called D'
(D prime).
Note: It is important that you use the
correct terminology. The example on
the left is a change in demand; the
previous example is a change in
quantity demanded.