Question

A new pair of shoes costs $50. In this case, money is a _

Answer 1

I believe the answer tp your question is: medium 

Answer 2

Answer: A medium of exchange.

Step-by-step explanation:

One of the fundamental functions of money in mainstream economics is being a medium of exchange, in opposition to being a common measure of value, a standard of deferred payment), or a store of value.

Money is a medium of exchange because it´s widely accepted that can be traded for goods and services.