I've always thought "money" is simply a way to avoid the inefficiencies of barter. It could be pieces of paper (or digits in a computer), but in theory it could just as easily be shells, twigs or anything else. The real value is from the goods and services produced by human beings, and money is simply a kind of oil that smoothes the exchange and trade of these goods.
The problem with this comment is "simply". The commenter is correct: real value does indeed consist of the actual goods and services produced by people. But saying that "'money' is simply a way to avoid the inefficiencies of barter" is like saying that a political system is simply a way to avoid the inefficiencies of anarchy, or a 747 is simply a way of avoiding the inefficiencies of walking to Cleveland. The present capitalist system, with money in such a central role, is so clearly not simply a smoother barter system that this comment can be seen only as an item of dogma propagated by the capitalist ruling intent on cloaking its power and influence.
I don't intend to be rude to the commenter: As years of discussing atheism and religion have taught me, the hardest step is losing one's attachment to the dogmas that are shouted at us continually from the moment we're capable of speech.
Money is indeed a way to smooth the exchange of goods and services. But it's so much more.