Karl Marx observed that workers produce virtually everything but get only a small portion of reward for it while the owners do little work and make large rewards off the labor of those who work for them. What is the term for this phenomenon?

Answer: Exploitation.

Explanation:

Exploitation in an organization occurs when the workers are used to full capacity and even overstressed but are given little reward by their employers in return for their efforts. Exploitation is done unfairly by Organizations that seeks to maximize profit.