Ben is Batman
Donna and Tom take Ben on a “Treat Yo Self” day to help him relax, but he just buys socks, which he feels like he needs. Donna and Tom challenge him to think about what he would buy for himself if he could get anything he wanted. Ben decides he wants a Batman costume.
See more: elasticity, income effect, income elastic, luxury goods, necessities, normal goods, preferences, subjective value, utility