<Li> a change in the distribution of income among consumers with different tastes . </Li> <P> Some circumstances which can cause the demand curve to shift in include: </P> <Ul> <Li> Decrease in price of a substitute </Li> <Li> Increase in price of a complement </Li> <Li> Decrease in income if good is normal good </Li> <Li> Increase in income if good is inferior good </Li> </Ul> <Li> Decrease in price of a substitute </Li>

If consumers do not respond at all to an increase in price demand is