Case study · Decision-support tool
Tradeoff
The open question
Every "which one should I pick" tool ends at price, and real choices almost never do. People trade money against time, against friction, against how well a thing fits the person they already think they are, and they stop optimizing long before a spreadsheet would tell them to. I wanted to see what a tool would look like if it took all of that seriously.
The pattern
The behavioral science already had the parts — diminishing returns, identity-based choice, the tax that friction puts on every decision — but nobody had wired them together into something you could actually use. Once I set them next to how people describe their real decisions, most of the model wrote itself: weight the axes, let the weights differ from one person to the next, and treat "good enough" as a real stopping point rather than a failure.
What it became
Tradeoff scores options across cost, time, friction, identity-fit, and diminishing returns instead of ranking on price. Every weight is visible and editable, because a decision tool you can't argue with is just an opinion wearing a progress bar.
What it demonstrates
The habit underneath it is finding the real unit of a decision and building around that, rather than the number everyone reaches for first.