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Success and failure are both difficult to endure. Along with success come drugs, divorce, fornication, bullying, travel, meditation, medication, depression, neurosis and suicide. With failure comes failure.
A learning curve is a concept that graphically depicts the relationship between the cost and output over a defined period of time, normally to represent the repetitive task of an employee or worker. The learning curve was first described by psychologist Hermann Ebbinghaus in 1885 and is used as a way to measure production efficiency and to forecast costs.