A Short History of Big Predictions

Before scoring a forecast, preserve its original wording and deadline.

Famous predictions tend to get shorter with age. A conditional argument becomes a slogan; a possible future becomes a promised date. John Maynard Keynes's 1930 essay Economic Possibilities for Our Grandchildren is a useful test case. He imagined enormous gains in living standards over roughly a century and suggested that three-hour shifts or a fifteen-hour week might help people adapt to abundance. That was a vision of what could become possible, not a labor-law deadline imposed on every country.

A fair score needs four fields: the prediction's original text, its date and geographic scope, its measurable outcome, and the date at which it should be evaluated. The horizon of Keynes's essay is around 2030, which has not arrived as of this draft. Still, the U.S. Bureau of Labor Statistics' 2025 time-use survey plainly describes a society in which employed people commonly work many more than fifteen hours per week. Its diary measures daily activities, not Keynes's entire philosophical idea of economic sufficiency.

Productivity growth alone never dictates how its gains are divided among higher output, higher pay, leisure, public services, and profits. Social choices and household obligations matter. It is reasonable to say that a broadly standard fifteen-hour workweek has not emerged in the United States by 2026. It is premature to score the entire 2030 prediction as a simple true-or-false proposition.

This series should apply the same rubric to a fixed sample of other dated forecasts, including successes. Selecting only spectacular failures would produce a good headline and bad history.

Sources: Keynes's original essay; BLS 2025 time-use survey; BLS long-term productivity.