Mental accounting: why your salary vanishes so fast

What is mental accounting? A definition with Algerian examples

The economist Richard Thaler, who later won a Nobel Prize, defined mental accounting as "the set of cognitive operations used by individuals and households to organize, evaluate, and keep track of financial activities" ( Thaler, 1999 ). Put simply, we all run a small accounting department in our heads. Unlike a real accountant, ours labels money according to where it came from and what it's meant for.

Economics textbooks say money is fungible, meaning one dinar can always replace another. Thaler showed that each of these mental habits breaks that rule, and that this is why they change our choices. A 5 000 DA bonus doesn't feel like 5 000 DA of salary, even though the épicerie will take either.

• Windfall money: the 3 000 DA a relative gives you at the Aïd goes on a treat, while the same amount from your salary would have paid the Sonelgaz bill.
• The untouchable box: you keep 40 000 DA in a CNEP account for the summer at the sea, then buy a fridge on facilités de paiement at a higher total cost, because the savings are off limits.
• Small leaks: a 200 DA coffee, a 500 DA flexy top-up for your Mobilis, Djezzy or Ooredoo line, a 350 DA Yassir ride. None of these has an account of its own, so nobody adds them up.
• Mental bills: the daret (a rotating savings circle) gets paid on time because it's labelled "commitment", while the money for the rentrée has no label and drifts away.

None of this is foolish. Labels help people keep to limits, and that is exactly why the daret works so well (see how the daret works ). Trouble starts with the spending that has no label at all.

The pain of paying: why cash hurts and cards don't

In 1998, Drazen Prelec and George Loewenstein described paying as a small, immediate pain, which they called the pain of paying. How much it hurts depends on how closely the payment is tied to the pleasure of what you buy. Counting notes at the till is as close as it gets, while a card or an instalment plan puts distance between the two.

Prelec and Duncan Simester then tested this with real money. In a study published in Marketing Letters in February 2001 , MBA students bid for tickets to a sold-out basketball game. Some were told they would pay by credit card, others in cash. The authors report that the effect "may be large (up to 100%)": the card group offered up to twice as much. In a second test, using a gift voucher with a known value, the effect was weaker and did not always appear.

Edahabia and CIB are debit cards, not credit cards, and the money leaves your account almost at once, so you shouldn't assume the same 100%. The mechanism still applies. Tapping a card or confirming an online payment doesn't hurt the way handing over 2000 DA notes does, and card payments are often the ones households underestimate.

The denomination effect: the broken 2000 DA note

Priya Raghubir and Joydeep Srivastava named the denomination effect in the Journal of Consumer Research in December 2009 . In one of their studies, students were given one dollar, either as four coins or as a single note, and could spend it on sweets or keep it. About 63% of those with coins bought something, compared with 26% of those holding the note. The amount was the same. Only the form was different.

They also found that people who knew they needed self-control chose to receive large notes, using them as a barrier against spending. There was a catch, though. Once a large note had been broken, people tended to spend more freely. Small change feels like loose money, while a large note feels like a sum you have to decide to break.

In Algeria the largest note is 2000 DA, which circulates alongside the 1000 DA and 500 DA notes and a range of coins ( Bank of Algeria ). Most people know the feeling: you break a 2000 DA note at the hanout, and by evening the 1 400 DA in change has gone.

Why your money runs out before the end of the month: one month, three wallets

Here is an invented but realistic example. A 70 000 DA salary is paid into a CIB account, part of it is moved to Edahabia, and some is taken out in cash. The question is how much the household thinks it spent, compared with how much it really spent.

The household thinks it has 12 000 DA left, but the account is empty. The biggest gap is on the card that hurts least, and in the cash column it comes from small notes nobody counted. This is often the real answer to "why isn't my salary enough": the problem is less the size of the salary than the spending you can't see. If your pay is close to the national figure, what an average salary covers gives you a benchmark.

How to turn these biases into tools

You won't get rid of these biases, and nobody has managed to. What you can do is arrange things so they work for you.

1. Label every dinar on payday: rent, food, bills, savings, leisure. Thaler showed that mental budgets hold spending back, so make yours explicit. The monthly budget guide takes you through it from one salary to the next.
2. Withdraw the month's cash in large notes, and keep small notes only for a weekly spending allowance. That way the denomination effect works in your favour.
3. Bring the pain of paying back to your cards. Note the amount after every Edahabia or CIB payment. Those few seconds do the job that counting notes does.
4. Set your savings aside first, somewhere separate: CNEP, a dedicated wallet or the daret. Money labelled "don't touch" tends to stay where it is, which is mental accounting working for you.
5. Check your totals by category once a week, not only at the end of the month. By the 25th it's too late to change anything.

Seeing every wallet in one place with Jibi

Jibi is a free app in Arabic, French and English, built for exactly this kind of tracking. You create a wallet for cash, one for Edahabia and one for CIB, each with its own balance. You can also add a wallet in a foreign currency, at the rate you choose. Jibi never connects to your bank, to Algérie Poste or to BaridiMob, and it never asks for card details. You note what you spend yourself, and that small act of noting is what brings the pain of paying back.

Statistics by day and by category show which wallet leaks the most. You can set a monthly limit for each category and get a warning before you reach it. Recurring entries such as your salary, rent and subscriptions are added automatically. Jibi works on the web, on iPhone and on Android. To go further, the 50/30/20 rule in dinars gives you a ready-made set of labels.