Would these be true or false and why? -a consumer with positive marginal utility for each good will always choose a bundle on her budget line. -if darren views milk chocolate and dark chocolate as perfect substitutes, then he buys whatever is cheaper. -Rita has well-behaved preferences over steak and fries. at her current consumption bundle of 3 steaks and 10 fries, her marginal rate of substitution between steak and fries is 1/2 (in absolute value). if you offered to take away one fry and give her a steak, she would take that offer.