Atlas of Cognitive Biases #46 · Gains, losses and risk. Cutting a small risk to zero instead of a big one by half
What it looks like in trading
moving the stop to break-even too early
covering small risks while ignoring big ones (e.g. having no contingency plan)
“I can't lose on this position” as a goal
An example from a session
After 10 points of profit the trader immediately moves the stop to break-even so that “the risk is zero”. Normal fluctuations knock them out of the position, while the real risk – having no daily loss limit – stays unaddressed.
What the research says
Viscusi, Magat and Huber (1987): participants were willing to pay disproportionately more to eliminate a small poisoning risk entirely than to reduce it. Baron, Gowda and Kunreuther (1993) described the same pattern in public policy decisions.
Preferring to eliminate a small risk completely over making a bigger reduction in a large risk. Zero has a special psychological value for us.
How does zero-risk bias show up in trading?
Typical signs: moving the stop to break-even too early; covering small risks while ignoring big ones (e.g. having no contingency plan); “I can't lose on this position” as a goal.
Educational content, not psychological advice or an investment recommendation.