Editing Demand curve (section)

===Factors affecting market demand===
In addition to the factors which can affect individual demand there are three factors that can cause the market demand curve to shift:

* a change in the number of consumers,
* a change of tastes among consumers,
* a change in the distribution of income among consumers with different tastes.<ref>{{cite book |last1=Binger |first1=B. |last2=Hoffman |first2=E. |title=Microeconomics with Calculus |edition=2nd |publisher=Addison-Wesley |year=1998 |isbn=0-321-01225-9 |quote=A change in relative price changes the distribution of income which in turn changes the demand curve }}</ref>

Some factors which increase the demand (the demand increase for every price - a shift of the demand curve to the right) 
*Decrease in price of a substitute
*Increase in price of a complement
*Decrease in income if good is normal good
*Increase in income if good is inferior good