Loss Aversion

Loss aversion is the finding from behavioural economics that losses hurt roughly twice as much as equivalent gains feel good. Winning $10,000 is pleasant; losing $10,000 is roughly twice as unpleasant, and the asymmetry is measured, not a metaphor. Kahneman and Tversky's prospect theory put the ratio near 2:1, which is why a coin-flip at even odds is rejected and why the decision needs double the upside before it feels fair.

For an Australian investor, the asymmetry shows up in the balance check. A $100,000 super allocation that falls to $85,000 triggers a stronger reaction than the run back to $100,000 rewards, which is how investors end up selling the drawdown and holding the cash. The market's volatility is survivable; the reaction to it is what converts a temporary fall into a permanent loss.

The mechanism is a value function with a kink at the reference point. Gains above the reference point register normally; losses below it register at roughly twice the slope, which is the 2:1 asymmetry wearing a statistics name. The reference point is usually the recent balance, the purchase price or the number last seen before the fall, and every judgement is made against it rather than against the long-term plan.

The arithmetic prices the asymmetry. A $100,000 portfolio that falls 20 percent to $80,000 needs a 25 percent gain to recover, because the recovery is calculated on the smaller balance. At 50 percent down, the required gain is 100 percent. The recovery maths is asymmetric in exactly the direction the feeling is not: the loss feels twice as bad as the gain feels good, and the recovery needs more than the fall took.

The behaviour follows the feeling. Selling during a drawdown converts the temporary fall into a permanent loss plus a late re-entry, and the cash option that feels safe is the one that compounds at savings rates while the market recovers without the holder. The drawdown risk calculator sizes the worst realistic fall against the holder before the market does it for free, and the risk tolerance entry covers the sizing decision.

For an Australian reader, loss aversion is the reason the super balance gets checked daily during a fall and rarely in a recovery, and the reason the cash option feels like a plan. Every super fund labels its options with a risk band, and the label is an invitation to price the downside against the feeling rather than the horizon. It also prices the small decisions - the extended warranty bought because the $300 loss looms larger than the $300 premium. The risk tolerance entry covers the sizing, and the feeling is what the sizing exists to outvote.

A colleague named Brent (yes, that Brent) moved his entire super allocation to the cash option after a five-week fall in 2020, felt enormous relief, and re-entered the market two years later at higher prices. The allocation he sold recovered to its pre-COVID level inside the year; the relief cost him two years of the recovery. The highest-leverage thing most Australians can do is size the allocation so the worst realistic drawdown is survivable, then pre-commit to a schedule the feeling cannot veto. The drawdown risk calculator runs the numbers on any allocation.