<Li> Decrease in income if good is normal good </Li> <Li> Increase in income if good is inferior good </Li> <P> There is movement along a demand curve when a change in price causes the quantity demanded to change . It is important to distinguish between movement along a demand curve, and a shift in a demand curve . Movements along a demand curve happen only when the price of the good changes . When a non-price determinant of demand changes the curve shifts . These "other variables" are part of the demand function . They are "merely lumped into intercept term of a simple linear demand function ." Thus a change in a non-price determinant of demand is reflected in a change in the x-intercept causing the curve to shift along the x axis . </P> <P> If a commodity is sold in whole units, and these are valuable for a consumer, then the individual demand curve can hardly be approximated by a continuous curve . It is a set function of the price, defined by a price above which no unit is bought, a price range for which one is bought, etc . </P>

​a movement along a demand curve for a good
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