Present bias

Topic: Schools of Economic Thought and Economic Laws · NCERT: Beyond NCERT

Meaning

Present bias is the habit of giving extra weight to a reward you can have right now, compared with a reward that comes later. The pull of "now" is stronger than any steady rate of patience would explain. Because of this, people keep putting things off and save too little for old age, even when they sincerely plan to save.

Economists usually model it with the β–δ (quasi-hyperbolic) model:
U = u₀ + β·[δ·u₁ + δ²·u₂ + δ³·u₃ + …]
u₀ = the pleasure you get today; u₁, u₂ … = the pleasure you get in each later period.
δ (delta) = the normal, steady discount factor. It is between 0 and 1.
β (beta) = the present-bias factor. It is between 0 and 1, and it shrinks every future reward by the same amount compared with today.
If β = 1, there is no present bias and the model becomes ordinary exponential discounting.

Explanation

How it works

Discounting means valuing future money less than money today. That by itself is normal and rational.
Present bias is something extra. "Today" gets a special boost that no future date gets.
Chain of cause and effect:
"enjoy today" wins over "save for later";
saving is postponed, again and again;
the result is procrastination (delaying tasks) and under-saving for retirement.
The person is not just ignorant. They often know what is good for them. They make a plan, and then the pull of "now" makes them drop it when the moment comes.

Time-inconsistency: why plans break

Present bias makes preferences time-inconsistent. This means a choice that looks right today looks wrong once the future date actually arrives.
Worked example (from the study note):
Choice A: ₹100 today or ₹110 tomorrow. Most people take ₹100 today. So waiting one day "costs" them more than 10%.
Choice B: ₹100 in 30 days or ₹110 in 31 days. The same people take ₹110 in 31 days. Now the same one-day wait seems to cost less than 10%.
When day 30 actually comes, choice B has turned into choice A. The person switches and takes the ₹100.
A rational person using exponential discounting (one fixed rate: PV = A / (1 + r)ᵗ, where PV = present value, A = amount, r = discount rate, t = time) would make the same choice in both cases. Their preferences stay the same over time.
A present-biased person behaves as if the discount rate falls as the delay grows. This is hyperbolic discounting: PV = A / (1 + k·t), where k = the impatience parameter. The value drops steeply for short delays and gently for long ones.

What makes it stronger or weaker

Stronger when:
the reward is immediate and easy to picture (shopping, a phone upgrade, a holiday);
the cost is far away and hard to picture (being poor in old age);
the good action needs an active step, such as filling a form, visiting a bank or starting a SIP.
Weaker when:
commitment devices are used. These are choices that lock in the future self, such as automatic salary deductions or fixed-term deposits with a penalty for early withdrawal;
defaults do the saving automatically, so doing nothing still means saving. This works because of status quo bias and inertia (reluctance to act or change) [2];
penalties are framed as losses, which uses loss aversion.

In India

Economic Survey 2018-19, Chapter 2, "Leveraging the Behavioural Economics of 'Nudge'" brought these ideas into Indian policy [2].
A nudge is a low-cost change in choice architecture (the way options are presented) that steers people towards good choices and still leaves them free to choose [2].
The Survey noted that people suffer from great inertia and tend to stick to the default. So changing the default on an enrolment form, which costs almost nothing, can turn that inertia to people's benefit [2].
Why this helps against present bias:
present-biased people keep delaying the step of "starting to save";
a default (opt-out) design takes the step for them;
so doing nothing now still leads to saving later.
Indian example: a young salaried worker plans every year to "start a pension plan next month" but spends the bonus on a new phone. If the pension contribution were automatic from the salary, with an option to leave, present bias would stop blocking the saving.
Macro link: under-saving by many households lowers the household savings rate, which is the main source of money for investment in India.
Thinker behind it: present bias is one of the "anomalies" (behaviour standard theory cannot explain) linked to Richard Thaler, who won the Nobel in 2017 and co-wrote Nudge [1].

Don't confuse with

Hyperbolic discounting: present bias is the behaviour (over-valuing "now"). Hyperbolic discounting is the model of it, in which the discount rate falls as the delay grows: PV = A / (1 + k·t).
Exponential discounting: uses one constant rate, so preferences are time-consistent. Valuing the future less is not a bias in itself. Present bias is the extra and inconsistent weight given to today.
Status quo bias: means preferring the current state of things, while present bias means preferring the current moment. Policy often uses status quo bias (defaults) to fix present bias [2].
Loss aversion: a loss hurts about 2× as much as an equal gain pleases. It is about gains versus losses from a reference point, not about now versus later.

Prelims Hooks

Present bias means over-weighting immediate rewards compared with future ones. It leads to procrastination and under-saving for retirement.
It makes preferences time-inconsistent: ₹100 today is chosen over ₹110 tomorrow, but ₹110 in 31 days is chosen over ₹100 in 30 days.
In the β–δ model, β < 1 means present bias. β = 1 gives standard exponential discounting.
Trap: under hyperbolic discounting the discount rate falls with delay. Exponential discounting uses a constant rate.
Present bias is one of Richard Thaler's anomalies (Nobel 2017). Loss aversion and the endowment effect come from prospect theory (Kahneman–Tversky, 1979) [1].
The chapter "Leveraging the Behavioural Economics of 'Nudge'" is in Economic Survey 2018-19. It says inertia makes defaults powerful [2].

Mains Points

Savings and pension policy (GS-III):
Present bias explains why households under-save for retirement even when they intend to save.
Auto-enrolment and default contributions in pension schemes turn inertia into saving [2].
Higher household savings then fund investment and growth.
Nudge versus mandate (GS-II/GS-III):
Defaults and commitment devices cost little and keep people free to choose [2].
But nudges cannot replace mandates where the harm is serious [2].
Critics call nudges paternalism, meaning the state deciding what is good for people. So they need to be transparent and easy to opt out of.
Financial inclusion and debt:
Present bias also delays loan repayment and encourages "buy now, pay later" borrowing.
Financial literacy, well-timed reminders and automatic EMI deductions can reduce defaults and over-borrowing among first-time borrowers.

Related concepts

Behavioural economics: bounded rationality, heuristics and biases

Sources

1Britannica: Richard Thalerbritannica.com · tier 3
2Economic Survey 2018-19, Vol. 1, Ch. 2: Leveraging the Behavioural Economics of "Nudge"indiabudget.gov.in · tier 1