5. In each of the following pairs of goods, identify the one which you would expect to have a more elastic price elas- ticity of demand. Briefly explain. a) Bread vs. fresh pineapples b) Airline travel in the long-run versus the short-run. c) Massages vs. prescription drugs. ma d) Sugar vs. restaurant meals. 6. Consider the following supply and demand curves for bat- teries: mati lers4458 Q% = 10 + 8PB + 7Pc QU = 100 - 4PB - 2PC where Pp is the cost of batteries and Po is the cost of copper. rs4458 a) Determine the equilibrium price and quantity for bat- teries (P; and Q;) in terms of the variable Pc. b) Using comparative statics, discuss how the equilib rium P; and @; changes as Pc increases and de- creases. c) Determine the price elasticity of supply and price elas- ticity of demand as a function of PB and Po. d) Let Po = 2, for what values of Po is the price elastic- ity of demand elastic, unitary elastic, and inelastic? e) Determine the cross-price elasticity of demand for bat- teries with respect to the price for copper, EQ8, Pc, what can we say about copper and batteries (demand substitutes or complements)