Pragmatist philosopher William James made a distinction almost no one in product development quotes: the difference between 'live' and 'dead' hypotheses. A live hypothesis is one you could, even barely, imagine acting on. A dead hypothesis is one you entertain intellectually but would never actually bet on. James's point — developed in *The Will to Believe* (1897) — was that how we *categorize* a belief changes how we investigate it. Dead hypotheses get tested lazily, with evidence arranged around them. Live ones get stress-tested. Most product managers run roadmaps full of dead hypotheses wearing the costume of live ones. The user need feels real, the business case checks out, the exec has seen it in a competitor — but nobody on the team would personally stake anything on it. That gap between 'we believe this' and 'we'd bet on this' is where roadmaps go quietly wrong. The practice James points to is almost uncomfortably direct: before the next build cycle, go around the room and ask everyone to say, out loud, whether the central assumption is live or dead for them. Not whether they support the initiative — whether they'd wager. The answers will be more honest than any PRD.

What is the last product bet your team *said* it believed in — and what would it have meant to actually wager something personal on it being right?

Drawing from American Pragmatism — William James (The Will to Believe, 1897)