Discounting Delayed Rewards
If offered $50 today or $100 in a year, most people take the money and run, even though it's technically against their best interests. However, if offered $50 in five years or $100 in six years, almost everybody chooses the $100! When confronted with low-hanging fruit in the Tree of Life, most humans cannot resist plucking it.
This is best summed up by the Ainslie-Rachlin Law, which states, "Our decisions... are guided by the perceived values at the moment of the decision - not by the potential final value."