The demand function for VCRs has been estimated to be Qv = 123 - 1.7Pt + 46 Pm - 2.1Pv -5M, where Qv is the quantity of VCRs,Pt is the price of a videocassette, pmis the price of a movie, Pv is the price of a VCR, and M is income. Based on this information, answer the following questions
- Are VCRs normal or inferior goods?
- Are movies substitutes or complements for VCRs?
- What additional information is needed to calculate the price elasticity of demand for VCRs?