Something struck me after writing several pieces on behavioral economics.
Every one of the concepts is familiar — prospect theory, mental accounting, nudge, hindsight bias. The problem is that because they get introduced separately, it is hard to know which one to reach for when you actually catch yourself having judged something badly.
So instead of listing concepts, this article tries to put them in order. Follow the stages by which a judgment gets made, and it becomes clear where each concept operates.
Stage 1: The reference point is set first
Every judgment starts not from an absolute value but from a reference point.
The same $1,000 feels completely different coming down from $5,000 than climbing up from $500. The core of prospect theory is that people perceive gains and losses as changes from a reference point, and that the slope on the loss side is steeper than on the gain side.
What matters is what follows. A reference point is not given; it is set — and usually set by someone other than you. Every sales technique that shows the list price before the discount stands on this principle.
Stage 2: Money gets a label
Once the reference point is fixed, the next step is classification.
In the textbook, money is fungible: a $1,000 bonus and $1,000 of salary are the same money. In practice the bonus disappears far faster, because in your head it went into the “found money” account.
That is mental accounting. The same amount is spent at a different speed and in a different way depending on the label attached. What is interesting is that these accounts are not purely irrational — partitioning a budget is also a self-control device. The question is whether you drew the partitions, or simply accepted a label someone else wrote.
Stage 3: The number of options changes the outcome
After the anchor and the account come the options.
The jam experiment is the famous one. A tasting table with 24 jams stopped more passers-by, but far more people actually bought when only 6 were on offer. The assumption that more options means more freedom breaks down right here.
Rational choice theory holds that more options let you choose better. In reality, past a certain count, the cost of comparison eats the benefit and people end up deferring or abandoning the choice.
Stage 4: Someone is designing all of this
By this point an obvious question arrives. Who sets the reference point, attaches the labels, and tunes the number of options?
The original intent of the nudge was choice architecture that improves decisions without restricting freedom — organ donation defaults, pension auto-enrolment. But the same technique, pointed the other way, becomes a dark pattern. Burying the cancel-subscription button three screens deep is, technically, the very same nudge.
Nowhere is the power of defaults clearer than in saving. Changing the default setting turns out to be far more effective than trying to change willpower.
Afterwards: why we fail to learn the lesson
Once a judgment has run through those four stages, one more thing kicks in: the editing of memory.
After the fact, everything looks inevitable. That sense of “I knew it” is hindsight bias, and it is dangerous because it paints over what information you actually had at the time. The material you would need to review your own reasoning disappears, and the same mistake repeats.
In the same vein, the habit of measuring yourself against other people is another form of the reference-point problem — because whoever you compare yourself to becomes the anchor.
Scaling up from the individual to the market
So far this has been about one person’s judgment. But when the same bias operates on tens of millions of people at once, the structure of the market itself changes.
Passive investing is the case in point. Once the entirely sensible advice “don’t try to beat the market, buy the market” became everyone’s default, a paradox emerged: the number of participants actually doing price discovery shrank. The optimum at the individual level produces a different result at the collective level.
To sum up
The reference point is set → money gets a label → the number of options is tuned → someone designs all of it → and afterwards memory is edited.
Studying behavioral economics does not make the biases go away. But knowing this order narrows down which stage to suspect when something feels off. Personally, I think that is the realistic benefit.
As more behavioral economics pieces get written, they will be added here.