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Answer:
Increase in income
Increase in price of substitutes
Change in taste
Explanation:
If income increases, the demand for a good rises as the amount of disposable income increases,
A substitute good is a good that can be used in place of another good. e.g. pen and pencils. If the price of a substitute (e.g. pens) increases, it becomes more expensive. Consumers would shift to the demanding pencils. As a result the demand for pencils would increase
A change in taste. For example, if an individual prefers pencils to pens. he would demand more of pencils and less of pend. As a result, the demand for pencils would increase