Which of these system was most popular in the pre-colonial era?

In the pre-colonial era, the most popular system of exchange was the barter system. This system involved the direct exchange of goods and services between people, without the use of money. For example, a farmer could exchange a bushel of wheat for a cow from a herder, or a blacksmith could exchange a tool for some grains from a miller. The barter system was the most popular in the pre-colonial era because it was a simple and practical way for people to exchange goods and services. It did not require any complex financial instruments or systems, and it was easy to understand and implement. Additionally, people often had limited access to coins or paper notes, which were not widely used at that time. While the barter system was effective, it also had some limitations. It was often difficult to find someone who had the exact goods or services that a person wanted to exchange, and it was hard to determine the value of different goods and services relative to each other. Despite these limitations, the barter system remained the most popular means of exchange in the pre-colonial era.