If you could find some way to model the price vs demand you could then figure out how elastic the price is (http://en.wikipedia.org/wiki/Price_elasticity_of_dem

If you could find some way to model the price vs demand you could then figure out how elastic the price is (http://en.wikipedia.org/wiki/Price_elasticity_of_demand http://en.wikipedia.org/wiki/Price_elasticity_of_demand) then that would tell you which price is better.