As a general rule, the demand for a good is dependent on the price of the good. The demand for some goods is extremely sensitive to price, whereas the demand for other goods remains relatively stable despite fluctuations in price. In the case of alcohol and tobacco, there is a wide range of evidence from econometric research that demonstrates price is strongly associated with alcohol and tobacco use and related problems. A higher price is associated with lower use. Environmental prevention strategies that focus on increasing the price of alcohol, tobacco, and other drugs are categorized under the causal domain of economic availability.