The document discusses motivation theories including Vroom's Expectancy Theory and Equity Theory developed by John Stacey Adams in 1963. Equity Theory proposes that employees seek to maintain fairness or equity between the inputs they bring to their job and the outcomes they receive compared to others. When employees perceive inequity between their input-outcome ratio and others, the theory predicts they will take actions to restore equity such as changing inputs/outcomes, distorting perceptions, or leaving their job.