Classical economic models generally assume people discount future rewards at a steady, consistent rate — waiting an extra week for a bigger payoff should feel like the same trade-off no matter when that week falls. Ask people to actually choose, though, and their preferences flip in a way the steady-rate model can't explain: most people would rather have $100 today than wait a week for $110, but given the same choice pushed a year into the future — $100 in a year, or $110 in a year and a week — most people happily wait the extra week. The one-week delay is identical in both cases. What changed is when it starts.
A discount curve that's steep up close and flat further out
This pattern is called hyperbolic discounting, and it describes a systematic tendency to weight the near future far more heavily, relative to the distant future, than a simple constant discount rate would predict. Plotted as a curve, the rate at which people discount future value drops off steeply for delays close to the present, then flattens out considerably for delays further away — the same objective time gap gets valued very differently depending on how far in the future it starts. This isn't a matter of people being generally impatient or generally patient; it's specifically that the present moment exerts an outsized pull that fades once a reward is already somewhat removed from right now.
Present bias, not just impatience
The behavioural-economic term for the specific overweighting of the immediate present is present bias, and it's what produces the apparent inconsistency: preferences that seem perfectly patient when evaluating two future dates can flip to strongly impatient the moment one of those dates becomes "now." This isn't just an academic curiosity — it's a major explanatory factor behind why people who genuinely intend to save for retirement, stick to a diet, or finish a task well ahead of a deadline routinely fail to follow through when the moment of choice actually arrives, because a plan made in the abstract, evaluating two future dates against each other, doesn't carry the same weight once one of those dates becomes the immediate present, with its disproportionately strong pull.
What we're still unsure about
That people's discounting behaviour deviates from a constant rate in the specific hyperbolic pattern described here is well supported by decades of experimental evidence across many contexts. What remains more actively debated is the underlying mechanism producing it — whether present bias reflects a single unified psychological process, or several distinct factors (attention, emotional salience, uncertainty about the future) that happen to produce similar-looking hyperbolic curves in aggregate — and how reliably interventions designed around this insight, like automatic savings enrollment, actually counteract present bias across different people and situations remains an area of ongoing applied research.
This sits inside Intertemporal Choice & Hyperbolic Discounting, one of seven topics in Behavioral Economics, one of five domains in Economics, one of seventeen subjects the app can quiz you on.