The community we are studying must have reached such a stage of development that its economic functions and those immediately cognate to them form a well-defined group, and adequate means must be available so that we can, as it were, watch the performance of these functions and test our hypotheses and conclusions by observation and experience.
I am going to market.
Extrinsic motivation, on the other hand, refers to situations in which we do something because we expect some external reward.