Last Year, Joan Bought 50 Kilograms of Hamburger When Her

Multiple Choice

Last year, Joan bought 50 kilograms of hamburger when her household income was $40 000.This year, her household income was only $30 000 and Joan bought 60 kilograms of hamburger.Holding everything else constant, Joan's income elasticity of demand for hamburger is:

A) positive, so Joan considers hamburger to be an inferior good.
B) negative, so Joan considers hamburger to be an inferior good.
C) positive, so Joan considers hamburger to be a normal good and a necessity.
D) negative, so Joan considers hamburger to be a normal good.