6. Below are three estimates of the market demand for J iff peanut butter. The letters stand for the following: Q is quantity of J iff (in 10005 of jars); P is the price of Jiff (in $ per jar); P3 is the price of bread (a complementary good) in $ per package; Pp is the price of Peter Pan peanut butter (a substitute good) in $ per jar; I is average income (in $10003), Each demand estimate has at least one problem that should concern an economist. Under each demand, list one (and only one) problem with the estimate. _ o.5 2 _ Q = 1501' 1'25 PB Pp I 5 _ 0. . Q : 100p '2 P35 13:2 [1-5 Q = 501!\"-25 P5005 P35