If you were offered $50 now or $100 in a year, you’d likely take the $50 now. But what about $50 in five years or $100 in six years? We’ve only added a delay, but now it feels just as natural to wait for the $100.
Given two similar rewards, we humans have a preference for one that arrives sooner rather than later. More interestingly, we tend to discount the value of the later reward by an amount that increases with the length of the delay.
Playing around with the notion of time a bit, a study (Madden, Ewan & Lagorio, 2007) showed that gamblers have even been found to perceive more value in rewards obtained following unpredictable delays than those obtained following predictable delays. This is very much in line with the thinking that we respond favourably to rewards at random intervals than those at pre-defined, and therefore expected intervals.