We have not completely done away with the barter system. It is just less visible.

I worked on a farm for a while that grew vegetables, and bartered some of those vegetables for other products from neighboring businesses. We got a pallet of apples in exchange for squashes from a local orchard, and seconds frozen pizzas in exchange for veg for pizza toppings from a local restaurant. We even bartered labor. There was someone who came in every week and spent a few hours cleaning and organizing the tomato cooler in exchange for some tomatoes that were on their way out.

In each case it was mutually beneficial for all parties to exchange in kind without using cash.

So while bartering is not common, it still exists.