Everybody is a trader and money is a storage device of time
In this world, everybody is a trader. The thing that is traded changes depending on person. A stock market investor trades money in lieu of asset (stock).
Similarly people trade their time to acquire money. Think a bit more and you realize money is a storage device of time in some sense.
The stone age man had to spend time to hunt for food. Modern day person spends time on other economic activities which earns money, so the money can be spent to acquire food, which is one of the basic necessities of life.
There is a saying Time is Money. Considering these facts, it makes a lot of sense.
Money can perhaps buy something other than time – quality of life, not exactly quantifiable. For example you move to a lavish house which gives you happiness.