Marchetti's Constant
Version 1.0.0 · Updated 2026-07-30
CORE DEFINITION
Throughout human history, regardless of the evolution of transportation (from walking to horse-drawn carriages to high-speed rail), the daily time budget that people are willing to spend on commuting (round trip) has remained constant at approximately one hour. -
SCAFFOLDING EFFECT
Reduce cognitive load
The invisible boundary of urban expansion. - Why hasn't the city become "smaller" with faster subways, but rather "larger"? Because people did not use the saved time to rest, but instead moved to farther places (in exchange for larger houses), keeping commuting time unchanged. Technological progress has been consumed by the expansion of distance. This also implies: if flying cars become widespread, the city boundary will expand to hundreds of kilometers away.
Anchor fast decisions
Cesare Marchetti statistically found that regardless of advances in transportation technology, the one-way commuting time for urban residents has remained stable at about half an hour. People trade faster transportation for longer residential distances, expanding the "reachable range" while keeping the "time budget" constant.
MINIMUM ACTION
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Marchetti%27s_constantverified
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