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
Before the rise in his income, the consumer is buying OQ quantity at OP price on the DD demand curve. With the increase in income, his demand curve shifts to the right as D]D]. He now buys more quantity OQ1 at the same price OP. On the contrary, if his income falls, his demand curve will shift to the left.