Final answer:
The opportunity cost of spending $100 on a pair of sneakers is the value of the next best alternative that could have been chosen with that money.
Step-by-step explanation:
The opportunity cost of spending $100 on a pair of sneakers is the value of the next best alternative that could have been chosen with that money. In this case, the opportunity cost could be using the $100 to buy a textbook for a college course. By choosing the sneakers, you are giving up the opportunity to purchase the textbook which could have provided you with knowledge and helped with your education.