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.
(3) Geometrically, the demand curve (AR) of a firm is perfectly elastic under perfect competition and the marginal revenue (MR) curve coincides with it. As against this, the demand curve of a firm is elastic and downward sloping under monopolistic competition, and its corresponding MR curve lies below it.