To that society benefits from a medium of exchange, imagine a barter economy.
A barter economy has no medium of exchange. Goods are traded directly or swapped for other goods.
In barter economy, the seller and the buyer each must want something the other has to offer. Each person is simultaneously a seller and a buyer. In other to see a film, you must hand over in exchange a good or service that the cinema manager wants. There has to be a double coincidence of wants. You have to find a cinema where the manager wants what you have to offer in exchange.