Assume that the price of the sub sandwiches is $4 and the price of tacos is $2. When Harry's income is $14 he buys two Italian sub sandwiches and three tacos. The last column lists the values of the marginal utility per dollar for tacos when the price of tacos decreases to $1. Complete this statement: As a result of the change in price, the marginal utility of each taco Harry consumes increases and:

a. the substitution effect of the price change will cause Harry to buy more tacos if they are a normal good, and fewer tacos if they are an inferior good.
b. the substitution effect will cause Harry to buy another sub because his purchasing power has increased.
c. the substitution effect of the price change will cause Harry to buy more tacos and fewer subs.
d. the substitution effect will cause Harry to buy fewer tacos.

cognitive overload: having a lot on your mind impairs decision-making and tends to result in the simplest, but not necessarily best, option being selected.

empathy gaps: overlooking how you might feel in a different situation can result in unnecessary purchases, such as overbuying when shopping for food on an empty stomach.

optimism and overconfidence: wearing rose-tinted glasses and having unrealistic expectations about the future can affect money management and leave you unprepared for a change in circumstance.

instant gratification: seeking instant gratification drives impulsive spending and can undermine long-term planning and savings.

harmful habits: automatic or mindless behaviour can amplify a poor financial decision as it becomes a recurring event.

social norms: we are heavily influenced by the actions of others; while this can be in certain circumstances, it also contributes to the pressure to keep up with the joneses through conspicuous consumption.

the answers are

a, b, c, & e.