See Hint When both Jack in the Box and McDonalds increase their advertising simultaneously, we expect the equilibrium price for Jack in and the equilibrium quantity for Jack in the Box to the Box to 1st attempt When both Jack in the Box and McDonalds increase their advertisi and the equilibrium quantity for Jack i the Box to increase decrease cannot tell without more information ing simultaneously, we expect the equilibrium p. in the Box to increase decrease cannot tell without more information > 15