Known as the decrease in the marginal output of a production process as the amount of a single factor of production is incrementally increased, while the amounts of all other factors of production stay constant .Life has a marginal output which can be increased with age until you reach a point whereby your ages increases but you have no energy o perform or contribute greatly to the output. The active age of any person starts from 16 years in most cases. do you think you are contributing enough to the life output before you start diminishing ?

