Which of the following utility functions represent preferences that always result in an interior solution to the consumer's problem? (a) U(x,y) = 2x + In y (b) U(r, y) = x + y (c) U(r,y) = In r + 2y (d) U(1,y) = r³y! True or False? If good r follows the law of demand, the PCC (as the price of good z changes) must be upward sloping. (a) True (b) False

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