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.
On the other hand if the elasticity is positive, the goods are said to be substitutes, since an increase in the price of good 1 results in an increase in the quantity demanded of good 2. The income elasticity of demand is used to measure to what extent the quantity demanded of a good changes as consumer income changes.