Equity Theory is a social comparison theory that was developed in 1963 by J. Stacey Adams. The underlying premise of this theory is that people will correct inequities:

The ratio of your inputs to outputs is compared to the ratio of another’s inputs to outputs. You can compare your ratio to other employees with comparable positions. You might also compare your ratio (especially with regard to output) to your organization’s pay policies or past experience or to a standard. Annual industry surveys can serve as the benchmark.

Inputs involve all that you bring to the job – your education, the hours you work, level of effort, and general performance level. The output portion of the equation is generally measured in terms of the salary and fringe benefits that you receive. In some cases this could be prestige, approval, and status.

Any inequities in the relationship will be corrected as soon as they are detected. The only variable that you can manipulate is your input. So if you believe that the relationship is not in balance and that the ratio of your inputs to outputs is greater than the ratio of the comparisons, you will work to bring the relationship back into equity by reducing your inputs – increasing your absenteeism or performing at lower levels.

You can correct inequities in a number of ways. You can make the correction by changing the perception of the inputs or outputs. You may somehow rationalize your perception of the inequity. You may choose to change the comparison person or standard. Or, you may remove yourself from the situation (such as quitting your job).