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
Consumer Income. Changes in consumers' income cause a change in the demand for a good or service. When consumers' income increases, demand for goods also increases, causing the demand curve to shift to the right. This is because consumers spend more money when they have higher incomes.