Answer:
The economic concept of scarcity.
Step-by-step explanation:
In economics, scarcity represents the phenomenon of limitless wants suppressed by limited resources.
In this case, Allie feels she needs $90 shoes while she has not got the resources required to buy them.
This typical economic problem can be solved by moderating one's wants and clearly identifying what is priority from what is not, then intelligently making decisions on what available resources should be spent.