The Behavioural Economist
Predicts the irrational thing people will actually do.
What does The Behavioural Economist do?
The Behavioural Economist is the How people really decide lens on a Decidi council — one of 86 expert personas convened to review and challenge important work. It scrutinises assumptions of rational user behaviour, presence of cognitive biases, effectiveness of choice architecture. It never debates alone: it’s one independent voice among multiple frontier AI models that argue across rounds, with an impartial moderator and a proprietary Final QA audit before the verdict.
You are The Behavioural Economist. You predict how people will really behave, not how a rational model says they should — biases, defaults, loss aversion, friction, social proof and the gap between intention and action. You redesign choices and incentives around real psychology, and you spot where a plan assumes a rationality humans do not have. Challenge agents who model users as perfectly informed and self-interested. Be concise; name the bias at play and the nudge or friction that addresses it. Your blind-spot: behavioural tricks can slide into manipulation, so flag when a nudge serves the designer at the user's expense.
- Assumptions of rational user behaviour
- Presence of cognitive biases
- Effectiveness of choice architecture
- Misalignment of user incentives
When evaluating how real users will interact with your design or strategy.
- Over-reliance on rational decision models
- Unintended user friction points
- Manipulative nudges benefiting the designer
“What biases might influence user decisions here?”
“How does this choice architecture guide behaviour?”
“Are you assuming users are perfectly rational?”
No single lens is complete. Behavioural tricks can slide into manipulation, so flag when a nudge serves the designer at the user's expense. On a Decidi council that bias is deliberately checked — other personas argue the opposite case, and the Final QA audit catches what one viewpoint would wave through.
On Decidi, The Behavioural Economist never debates alone. It is one independent voice in a council of multiple frontier AI models — GPT, Claude, Gemini and Grok — that challenge each other across rounds. Its job is to surface what a single AI would miss; an impartial moderator then weighs the dissent, a Final QA audit checks the result for hallucinations, and you get one decisive verdict.
Questions
When should you bring in The Behavioural Economist?
When evaluating how real users will interact with your design or strategy. The Behavioural Economist scrutinises assumptions of rational user behaviour, presence of cognitive biases, effectiveness of choice architecture — the angle a single general-purpose AI answer tends to skip. On Decidi you seat it alongside other expert personas so the review is rounded, not one-sided.
Does The Behavioural Economist make the call on its own?
No. The Behavioural Economist is one independent voice in a council of multiple AI models. An impartial moderator weighs its argument against the others, and an always-on Final QA audit reviews the verdict for hallucinations and weak reasoning before you act on it.
Which AI model runs The Behavioural Economist?
The Behavioural Economist runs on a frontier model, and a council assigns its members across OpenAI GPT, Anthropic Claude, Google Gemini and xAI Grok — so a multi-member debate genuinely spans different models rather than one model role-playing several.