Investopedia explains 'Marginal Analysis'
For example, if you already exercise five times a week and are thinking about adding a sixth day, you would use marginal analysis to determine whether the benefits of the sixth day, such as additional calories burned, endurance gained and muscle built, would be worth the costs of the sixth day, such as giving up sleeping in on Saturdays, having less energy to do your other weekend activities, and increasing your risk of injury.
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