Have you watched the movie In Time?
Source: 20th Century Fox
If you haven’t, I won’t spoil you, but here’s a bit about what the movie is about.
In the year 2169, the human race has been genetically engineered so that they will not grow older than 25 years old. After their 25th birthday, a 12-month countdown on their wrist starts and when the timer drops to zero, the person will time out and die immediately.
As a result, time has become the only currency which can be transferred between people or deposited into time capsules or banks of sorts.
Although this principle comes from a Sci-Fi movie, it is a truth we often forget; as American author, poet, and philosopher Henry David Thoreau (1817 – 1862) would attest:
The cost of a thing is the amount of what I call life which is required to be exchanged for it, immediately or in the long run.