Psychology › Thinking, memory & biases › Behavioral economics
Present bias (hyperbolic discounting)
1975; 1997· Finding or experiment
Mixed evidenceSome support; effects smaller or less consistent than once thought.
Present bias is overweighting immediate rewards, so plans to save, diet or exercise collapse when the moment actually arrives.
See it on the Psychology map →What it says
People are patient about the future but impatient about now. Many prefer $100 today over $110 tomorrow, yet choose $110 in 31 days over $100 in 30. Economists model this as 'hyperbolic' or quasi-hyperbolic discounting: value drops steeply for any delay from now, then only gently. George Ainslie described the pattern from animal and human data in 1975; David Laibson's 1997 model brought it into mainstream economics.
Why it matters
It helps explain undersaving, procrastination and credit-card debt, and why automatic enrollment and commitment plans like Save More Tomorrow raise retirement saving.
Think of it like
Like deferring roof work every year because this year's cash feels more urgent than next decade's leak.
The evidence
Mixed evidence. It shows up in many choice studies and real savings behavior, but estimates vary widely, and with real money rather than hypothetical choices some studies find it small.
Open questions
Whether it reflects true impatience or doubt that future rewards will arrive, and why it appears more for effort and food than money, is debated.
Connections (5)
▸Defaults and 401(k) auto-enrollment counteract Present bias (hyperbolic discounting)Well replicated
The connection
Present bias makes people put off costs now for benefits later: saving can always start next month. A default flips the effort, so saving happens unless you act to stop it. Thaler and Shlomo Benartzi's Save More Tomorrow went further, committing workers in advance to raise contributions at future pay raises, when the pain feels distant.
Who showed it and when
Save More Tomorrow was first tried at a midsized US manufacturer from 1998; Thaler and Benartzi published the results in 2004.
The evidence
At that firm, participants' average saving rate rose from 3.5% to 13.6% over about 40 months, and most stayed in the program.
Open questions
Whether defaults truly fix present bias or simply exploit inertia; people who never actively chose may not understand or value their own savings.
▸The marshmallow test tests children's resistance to Present bias (hyperbolic discounting)Mixed evidence
The connection
The test is a child-sized version of the choice present bias describes: a small reward now versus a bigger one later, with the immediate option in plain sight. Mischel found that making the treat less vivid, such as imagining it as a picture or a puffy cloud, extended waiting, an early sign that how temptation is framed shapes impatience.
Who showed it and when
Stanford's Bing Nursery School, late 1960s–1970s; Janet Metcalfe and Mischel's 'hot and cool' model, 1999; economists studying delay discounting from the 1980s on.
How solid is it?
Mischel's strategy experiments show framing changes waiting. The link to adult present bias is indirect, since the task also measures trust and hunger.
Open questions
Whether children's waiting reflects stable impatience or a sensible bet about whether the adult will really return with the second treat.
▸Self-control and willpower resist Present bias (hyperbolic discounting)Well replicated
The connection
Present bias is the pull toward now; self-control is the counterweight. Because willpower in the moment often loses, the best tools are commitments made in advance, like Ulysses tied to the mast. Philippine bank customers offered a locked savings account saved markedly more, and US workers who committed future raises to saving lifted their savings rate from 3.5% to 13.6%.
Who showed it and when
Nava Ashraf, Dean Karlan and Wesley Yin's 2006 bank study in the Philippines; Richard Thaler and Shlomo Benartzi's Save More Tomorrow plan, published 2004.
The evidence
Randomized trials show many people voluntarily lock themselves in and then save more, evidence that they recognize their own present bias.
Open questions
Why some people refuse commitment tools that would help them, and whether locked accounts add new saving or merely shift money from elsewhere.
▸Present bias (hyperbolic discounting) is modeled in Behavioral economicsWell replicated
The connection
Behavioral economists turned present bias into a simple formula, the 'beta-delta' model: any future reward gets one extra discount just for not being now. It predicts people who plan to start saving next month but never do, and explains why commitment devices and automatic enrollment work.
Who showed it and when
Edmund Phelps and Robert Pollak, 1968; popularized by David Laibson at Harvard (1997) and by Ted O'Donoghue and Matthew Rabin (1999).
The evidence
Field studies fit its predictions, such as gym members overpaying for unused memberships (2006) and higher saving with locked accounts in the Philippines (2006).
Open questions
Measured present bias is often small for money but larger for effort or food; whether the simple model captures real behavior is debated.
▸Present bias (hyperbolic discounting) is steep in Addiction and substance use disordersWell replicated
The connection
People with addictions discount future rewards much more steeply than others: in choice tasks they more often take a small amount now over a larger amount later. That steep present bias helps explain why the immediate high wins out over long-term health, money and relationships.
Who showed it and when
Warren Bickel and colleagues found steep discounting in opioid users in the late 1990s; similar results followed for alcohol, nicotine, cocaine and gambling.
The evidence
Meta-analyses in 2011 and 2017 confirmed steeper discounting across many substance use disorders; in some studies it also predicts relapse.
Open questions
Whether steep discounting comes before drug use, results from it, or both is unsettled; there is evidence for each direction.