Concept:A shift in the demand curve is caused by non-price factors that affect demand.
Explanation:A shift from
D0D0 to
D1D1 means demand changes at every price level.
Non-price determinants of demand include consumers income and population size.
An increase in consumers income raises demand, while a larger population also raises demand.
A change in the price of the commodity causes movement along the same demand curve, not a shift.
Change in technology affects supply, not demand.
Therefore, the correct combination of factors is consumers income and population size.
Answer:C. consumers income and population size
