Before the 1 of money, people used to get the goods and services they wanted by swapping things with others. The system was entirely 2 on an agreement between both people, who each needed to have what the other wanted.
The system of 3 started to work much more smoothly with the 4 of money. By using precious metals which had been 5 weighed and made into coins, it became possible to sell what you produced in return for coins, and then use the coins to buy anything you wanted from a third party.