Retirement

Retirement is the point where a person stops employment completely. This usually happens upon reaching a determined age, when physical conditions don't allow the person to work anymore by illness or accident, or even for personal choice usually in the presence of an adequate pension or personal savings.

 A person may also semi-retire and keep some sort of retirement job, out of choice rather than necessity. A useful and straightforward calculation can be done if we assume that interest, after expenses, taxes and inflation is zero. Assume that in real terms, your salary never changes during your w years of working life. 

This usually happens upon reaching a determined age, when physical conditions don't allow the person to work anymore by illness or accident, or even for personal choice usually in the presence of an adequate pension or personal savings.

 The retirement with a pension is considered a right of the worker in many societies, and hard ideological, social, cultural and political battles have been fought over whether this is a right. In many western countries this right is mentioned in national constitutions.