Tara buys four music cassettes when the price is $10 and two cassettes when the price is $14 . Her price elasticity of demand is:

Any change that increases the quantity of labor supplied at all wage rates will ________, assuming all else equal

A) shift the labor supply curve to the left B) cause an upward movement along the labor supply curve C) shift the labor supply curve to the right D) cause a downward movement along the labor supply curve

Jane contributes time and money for charity because she values helping others. This is an example of ________

A) pure altruism B) rationalism C) impure altruism D) liberalism