c. baseball cards check all that apply 3 baseball cards can keep fairly well over time so they could act as a good store of value.unanswered baseball cards could fulfill the medium of exchange function if everyone agreed to accept them for goods and services.unanswered baseball cards have rapidly changing prices, making them a poor tool as a unit of account.unanswered baseball cards have steady prices, making them a good tool as a unit of account.unanswered baseball cards are made of cardboard so they are a poor store of value.