Double take: Oliver and James as the Weasley twins in the 2003 film Harry Potter And The Prisoner Of Azkaban surrounded by their co-stars. Identical: James, left, and Oliver Phelps arrive at London's Odeon Leicester Square for the world premiere of 'Harry Potter and the Chamber of Secrets' in 2002.
An increase in demand is represented by a shift of the demand curve to the right: A decrease in from ECON 101 at Universitat Pompeu Fabra
3. an increase in the price of a substitute good. 4. a decrease in the price of a complementary good. 5. an increase in the number of potential consumers in the market. Opposite changes in the above factors will cause the demand curve to shift down or to the left (i.e. less will be demanded at each price than before).