Agricultural products are generally necessities, with income elasticities less than 1. However, the larger income elasticities for apples and cream mean that con- sumption will increase more than proportionately with increases in income. Broiler chickens have changed from a luxury good in the 1950s to a necessity today, as evidenced by the decrease in the size of their income elasticity. And, as expected, chicken is a substitute good with beef and pork, because chicken has a positive cross price elasticity of demand with both of these products.