Barter is literally my life. I teach other people’s children about life and Computer Science in order to buy potatoes. The children’s parents make medicine and build houses to pay for their children’s education. Is your point that barter is about goods, whereas most people provide services (time, labour?)
Or perhaps you mean that the majority of the economy in terms of wealth is engaged in the investment of capital, and we potato eaters are but a percentage of a percentage?