Why Tomorrow’s Self Gets the Bill | HL Hunt
Why Tomorrow's Self Gets the Bill
Skipping one $298.62 loan payment costs $149, half the amount deferred. Paying $12 a month instead of $120 a year implies a 51% annual rate. Paying the minimum on a $3,000 card takes 15.2 years. Each structure makes the present cheaper and the future dearer, and each is chosen more than its price justifies. The difficulty is that a household with no cash makes exactly the same choices for entirely rational reasons.
What you'll learn
Two selves, one bill
Economists call it present bias: people weight what happens now more heavily than any consistent discount rate would justify, and then weight the following period the same way when it arrives. A common way to model it is a single factor applied to everything that is not today. At 0.7, a $100 cost next month feels like $70 now, while a $100 cost today feels like $100.
The important property is that the preference reverses. Asked today to choose between paying $100 in eleven months or $105 in twelve, most people take the later $105. Asked again eleven months from now, when the $100 is immediate, many switch. Nothing has changed except which self is choosing.
That reversal is a gap, and a gap is something that can be priced. A product that moves the cost later and the benefit earlier will be chosen more often than its true cost justifies, by people who would not choose it if they were deciding on behalf of their future self.
Three places the gap is priced
| Structure | What it costs |
|---|---|
| Skip a payment on a $12,000, 9%, 48-month loan | $149 including a $35 fee, to defer one $298.62 payment: 49.9% of the amount deferred |
| Pay $12 a month instead of $120 a year | An implied 51% effective annual rate on the $108 not paid up front |
| Pay the minimum on $3,000 at 24% | 15.2 years and $4,887 of interest, against 26 months and $870 at $150 a month |
None of these products is hidden. The skip fee is disclosed, the annual price is on the same page as the monthly one, and the minimum payment warning is printed on the statement. Per our deferred interest analysis, disclosure tells today's self what tomorrow's self will pay, and today's self discounts it by exactly the factor that made the product attractive.
The common feature is the shape, not the price. Each one makes the present cheaper and the future dearer, and each one is chosen at the moment when the present is most vivid. Per our sequencing analysis, the offer usually arrives at the point of strain, when the gap between the two selves is widest.
The explanation that looks identical
This is where most writing on present bias goes wrong. The same behaviour has a second, entirely rational explanation, and the two cannot be told apart by watching what people choose.
A household that does not have $120 cannot pay annually. For that household, $12 a month is not a mistake; it is the only option, and the 51% implied rate is the price of liquidity it genuinely lacks. A household with $298.62 due and $150 in the account is not discounting the future. It is avoiding a returned payment that would cost more than the $149 skip.
The liquidity case deserves to be taken seriously
Per our cost of waiting analysis, a household without savings faces a real and high cost of funds, and choosing the expensive structure can be correct given that cost. Per our variance analysis, households whose income varies need flexibility more than they need a low price, and products that sell flexibility are meeting a genuine demand. Treating every deferral as a bias to be corrected is a form of paternalism that substitutes the observer's circumstances for the household's. The useful distinction is between households who defer because they must and households who defer because the deferral is vivid and the cost is not. The first group needs cheaper liquidity. The second needs a different choice architecture. A single policy aimed at both will fail one of them.
One test separates them. A household constrained by liquidity takes the expensive option when cash is short and the cheap option when it is not. A household driven by present bias takes the expensive option even when it has the cash, and per our withholding analysis, the same household often holds money in a low-yield form while paying a high rate elsewhere.
The other side: products that help
Present bias is not only exploited. It is also the reason several useful products exist, and the same mechanism runs in the opposite direction.
- Over-withholding works as forced saving because the money is gone before today's self can spend it. Per our withholding analysis, at a 5% opportunity cost it is a cheap commitment device.
- Automatic payments remove the monthly decision, which is where present bias acts.
- Fixed installment structures force principal down on a schedule that a revolving minimum does not. Per our prepayment analysis, the schedule does the work that intention would otherwise have to.
- Defaults set to the future self's interest, such as a payment set above the minimum, change outcomes without removing any choice.
So the design question is not whether to use present bias but which self the default serves. A minimum payment set at 1% plus interest serves today. The same product with a default payment that clears the balance in three years, which the customer can lower, serves tomorrow, and per our friction analysis a small amount of friction in the right place often matters more than the price.
Who earns the gap
If a product earns its margin from the difference between what people intend and what they do, its revenue depends on that difference persisting. Per our subscription analysis, a business whose economics rest on customers forgetting to cancel has a structural interest in making cancellation hard, and per our complexity analysis pricing that is hard to compute protects a gap that a simple price would close.
This creates an observable distinction between two kinds of provider. One earns its margin on the service and would be indifferent to customers behaving as they intend. The other earns disproportionately from customers who behave against their own stated plans. The first welcomes tools that help customers follow through; the second resists them. Per our contract analysis, which kind a provider is usually shows up in its defaults rather than its disclosures.
Testable implications
- Revenue from deferral features should be concentrated among customers who had sufficient funds at the time they deferred, if present bias rather than liquidity drives use.
- Setting a default payment above the minimum should raise average payments substantially while leaving the share of customers paying exactly the minimum near its old level among those who actively choose it.
- Providers whose margin depends on deferral should show slower adoption of reminder and automation tools than providers whose margin does not.
- Deferral offers should be accepted more often when presented at the moment of payment than when presented in advance with the same terms.
The first implication is the one that matters for policy. If deferral is used mostly by households without funds, the problem is the cost of liquidity and the response is cheaper credit. If it is used mostly by households with funds, the problem is the structure and the response is better defaults. Per our legibility analysis, the data to tell these apart usually exists inside the provider and is rarely examined, and per our device financing analysis, the same question can be asked of almost any product that converts a present price into a future plan.
Frequently asked questions
Weighting now more than a consistent discount rate would, so preferences reverse as the future arrives. At 0.7, $100 next month feels like $70 now.
Skip-a-payment (49.9% of the deferred payment here), monthly over annual pricing (51% implied rate), and minimum payments (15.2 years on $3,000).
No. Liquidity constraints produce the same choices rationally. The test is whether the expensive option is chosen even when the cash is available.
Through defaults that serve the future self: automatic payments, fixed schedules, and default payments above the minimum that customers can still lower.
Key takeaways
- Present bias makes a $100 cost next month feel like $70 now, and preferences reverse as the future arrives.
- Skipping one $298.62 payment on a $12,000 loan costs $149, or 49.9% of the amount deferred.
- Paying $12 a month instead of $120 a year implies a 51% effective annual rate.
- The minimum on $3,000 at 24% takes 15.2 years and $4,887 of interest, against 26 months and $870 at $150.
- Liquidity constraints produce identical choices for rational reasons, so behaviour alone cannot diagnose bias.
- The test: a constrained household defers only when cash is short; a biased one defers even when it is not.
- The same mechanism powers useful commitment devices, so the question is which self the default serves.
- A provider whose margin depends on the gap will resist tools that help customers follow through.
This analysis is educational and does not constitute financial advice. All figures are stylized illustrations using assumed loan terms, fees, prices, interest rates, minimum payment formulas, and a simplified model of present bias, and do not describe any particular product, provider, or household. Behavioural models are simplifications, and individual circumstances, including liquidity, income variability, and access to credit, determine whether a given choice is costly. Consult a qualified adviser about your own situation.