Atlas of Cognitive Biases #44 · Gains, losses and risk. A dollar is a dollar
What it looks like in trading
a “trading account” treated less seriously than savings
the day's profit treated as a separate pot to risk
each trade as a separate account (avoiding closing at a loss)
An example from a session
A trader has a “cushion from September's profits” and risks it more boldly. It's the same money as the rest of the account. Money and emotions: Trader fitness, Performance under pressure #12.
What the research says
Richard Thaler (1985, 1999) described mental accounting. Tversky and Kahneman (1981): people who lost a $10 theatre ticket were less likely to buy a new one (46%) than people who lost a $10 bill and then wanted to buy a ticket (88%). Financially, the loss was the same.
Dividing money into mental “accounts” and treating them differently, even though money is interchangeable. Money from profits, from a bonus or “for learning” seems to have different value.
How does mental accounting show up in trading?
Typical signs: a “trading account” treated less seriously than savings; the day's profit treated as a separate pot to risk; each trade as a separate account (avoiding closing at a loss).
Educational content, not psychological advice or an investment recommendation.