Final answer:
A primitive economy is characterized by isolated, self-sufficient economic units. This means that these units are self-reliant and do not depend on other units for their economic needs. In such economies, groups or individuals produce what they consume and there is little or no trade with other groups.
Step-by-step explanation:
A primitive economy is characterized by isolated, self-sufficient economic units. This means that these units are self-reliant and do not depend on other units for their economic needs. In such economies, groups or individuals produce what they consume and there is little or no trade with other groups. This type of economy was common among hunter-gatherer societies in the past.
For example, in hunter-gatherer societies, each group had to continually move and carry all their possessions with them. They only had access to the resources they could find or carry, and there was limited interaction with other groups. This made their economies isolated and self-sufficient.
Therefore, the statement "isolated, self-sufficient economic units mark a more primitive economy" is true.