Money serving as an intermediary between the buyer and the seller is money acting as a:

1. Money is defined by the jobs it performs. 2. First, money serves as a medium of exchange. 3. That means money acts as an intermediary between the buyer and the seller. 4. Store of value and unit of account are its other two functions. _Source: OpenStax Principles of Macroeconomics for AP Courses 2e (CC BY 4.0), Ch 13 'Money and Banking'_