Answer:
Alliie's situation best illustrates scarcity.
Explanation:
Scarcity refers to the situation when there are unlimited wants and limited resources. In the given scenario, Allie wanted to buy running shoes which cost her $90. However, her debit card was declined because she did not have enough resources (money) to pay for the shoes. Scarcity is a rather common concept which is applied all over the world because people have unlimited wants and limited resources to cover their demands.