Question

Jack agrees to sell Tyler his pocketknife for 3 baseball cards. Tyler sells his soccer ball for 2 baseball cards. In what way are baseball cards used in this example? In this example, baseball cards are used as a

Answer 1

The base ball cards are used as a sort of currency or money. Back then when the humans were just starting out they needed to pay and used shells and worthy rocks like emeralds or rubies. Now they're are dollars, or sentimentos. Between friends there could be baseball cards or pikachu cards.
Hoped I helped!