Her father is Robert Ellis Silberstein (Jewish). Her mother is Diana Ross (African-American).
If the cross price elasticity is positive, then we call such goods Substitutes (example: pizza and burgers -- you usually consume either or). The income elasticity of demand measures the change in the quantity demanded of some good, when the income changes, holding everything else constant.For example you can measure what happens to the demand for expensive red wine when income increases.f the cross price elasticity is positive, then we call such goods Substitutes (example: pizza and burgers -- you usually consume either or). The income elasticity of demand measures the change in the quantity demanded of some good, when the income changes, holding everything else constant.
Determinants of price elasticity include: Availability of substitutes - if substitutes are plentiful, then demand should be elastic. Relative percentage of expenditure - if an item takes up a considerable proportion of a consumer's income, then demand should be elastic; if it takes up a very small amount, then demand should be expected to be inelastic.