In a market, when the price of a substitute good increases, the demand for the original good tends to __________.

When the price of a substitute good increases, the demand for the original good tends to rise. This happens because people look for alternatives when prices go up. For example, if the price of butter increases, many people might start buying more margarine instead, which is a substitute for butter. As more people choose margarine, the demand for it goes up because it's seen as a cheaper option. Therefore, a change in the price of a substitute can directly affect how much of the original good people want to buy.