Suppose that ms. thomson is currently exhausting her money income by purchasing 10 units of a and 8 units of b at prices of $2 and $4, respectively. the marginal utility of the last units of a and b are 16 and 24, respectively. these data suggest that ms. thomson:

a. has preferences that are at odds with the principle of diminishing marginal utility.
b. considers a and b to be complementary goods.
c. should buy less a and more b.
d. should buy less b and more a.

Who is not spending wisely? erika goes shopping and saves her receipts. she totals how much she spent and writes it down. mia needs to buy a new pair of shoes because she joined the soccer team. she looks at newspaper ads to find the best price. lauren has been thinking about getting a puppy for a long time. she walks by the pet store at the mall and decides to get a puppy. erin makes a purchase online using a credit card. she knows that she can pay the entire bill when it arrives.