- The propensity for a continuing application of effort or skill toward a specific task or goal to decrease in effectiveness after a specific degree of result has-been achieved.
- The inclination for a consistent effort toward a certain objective to decline in effectiveness after some success is attained.
- A relationship between input and result, so that incorporating products of every one input (labour, money etc.) to fixed levels of the others will produce successively smaller increments of output.
- a law affirming that to continue after a particular standard of performance has-been reached can lead to a decline in effectiveness