Suppose, in a binary logit model, that the "own-" and "cross-" price elasticities of demand for mode "a" are -0.34 and 0.15, respectively. a) Interpret these numbers. b) What is the effect on the demand for mode "a" of a 15% increase in the price? Does this represent a change in demand or a change in quantity demanded? c) What is the effect on the demand for mode "a" when the price of mode "b" increases by 15%? Does this represent a change in demand or a change in quantity demanded