I'm not necessarily saying that I think money is a bug. It might be a feature. But the "market's invisible hand" relies on people being more motivated by their wealth stash than their behavior. If everyone chose to keep doing the same physical actions they're doing today except we stopped swapping money, nothing observable in reality would change; people would die at the same rate, food would be stored at the same rate, etc.
"The economy" is in reality a giant standoff where every member of the standoff would just stop maintaining society unless they get paid for it. The grocer could theoretically choose to continue to man the store 12 hours per day, and then the doctor could theoretically choose to treat the grocer when he gets sick, and the truck driver could theoretically choose to ship the medication from the plant to the hospital, and the floor worker could theoretically choose to...