I've always thought about it this way: We trade our time (work) for money and later trade that money for time (other's work). We see this manifestation in lots of places: bus is cheap but also costs time vs limousine is expensive but uses minimum time. Growing food is dirt cheap but also costs time vs buying produce is expensive but uses minimum time. This exchange has also allowed the producers to invest in efficiencies and economies of scale. All told, this is why I generally have a rule to not spend money on anything that doesn't buy me time, it is my most limited resource.
That sounds almost poetic. I wish people who mindlessly rail against capitalism on twitter actually took the time to understand how these systems work. I think many of them would like to believe that we can all live in a system without currency. They don't realize that much of the freedom we enjoy today comes from capitalism. The ability to start your own business, and more fundamentally, to decide how your money (and time) is spent. Communism and centralized control over resource utilization necessarily results in less freedom.
