Bucketing of wealth

Money is fungible — a rupee in one account is worth exactly the same as a rupee in another. But investors rarely treat it that way. They mentally sort their wealth into labelled buckets, and each bucket gets its own rules.

The workbook's examples are the ones every household recognises: a retirement fund, a children's education fund, a marriage fund. Keeping wealth in mental buckets like this does have a benefit — it helps investors keep track of progress toward each goal. But it comes with a cost the workbook flags directly: it often leads to selecting assets separately for each bucket, in a way that could have been avoided if the investor looked at the overall portfolio together and optimised it as a whole.

Bucketing of wealth is closely related to the wider bias of mental accounting, developed by Richard Thaler — the tendency to treat one sum of money differently from an equal-sized sum, depending on which mental account it is assigned to, rather than thinking in terms of overall net worth.

The practical distortion the workbook highlights: an investor with three goal-buckets might independently choose a conservative allocation for the education bucket, a conservative allocation for the marriage bucket, and a conservative allocation for the retirement bucket, one goal at a time — even though, viewed together, some of these goals are decades away and could comfortably carry more equity risk, while others are near-term and genuinely need protecting.

Treated bucket by bucket, the investor may end up more conservative overall than their real risk capacity and time horizon justify, simply because each bucket was optimised in isolation rather than as part of one combined portfolio.

Illustrative figures.

Mr and Mrs Iyer have three mental buckets, each invested separately:

Each bucket got the same cautious 30% equity allocation, because the couple mentally treated every bucket as needing the same "safe" treatment.

Looked at as one combined Rs 65,00,000 portfolio against the couple's actual time horizons, this is inefficient in both directions: the retirement bucket, 25 years away, could reasonably carry far more equity than 30% without threatening the goal, while the marriage bucket, only 3 years away, is arguably still carrying too much equity risk at 30% given how little time it has to recover from a downturn. Viewing wealth as separate buckets, rather than one portfolio serving several goals over different horizons, led the couple to a uniformly cautious — and collectively sub-optimal — allocation.

Chapter 16 (Basics of Behavioral Finance), section 16.3, discusses bucketing of wealth as an outcome of mental accounting, immediately before covering framing bias. Expect a question on why goal-based bucketing can lead to sub-optimal asset selection, and how an adviser should respond — by evaluating the portfolio holistically rather than bucket by bucket.

• Bucketing helps with tracking goals but can hurt asset allocation — the workbook presents both sides, not just the downside.
• The fix is to view the portfolio as a whole, matching each goal's own time horizon to its own appropriate risk, rather than applying one uniform "safe" allocation across every bucket.
• This is a specific application of mental accounting, not a separate, unrelated bias — money kept in different mental buckets is treated as non-fungible, exactly as mental accounting predicts.
• A retiree with a near-term goal and a young saver with a distant goal should not necessarily use the same allocation for that goal, even if both mentally call it a "safe bucket".