Brief · The Org
The four-day week is mostly a recruiting tool
Treat it as one and the math works out. Sell it as productivity and it collapses.
Every published four-day-week pilot reports a productivity gain. Every long-running implementation reports productivity neutral or slightly down. The two facts are not in tension. The pilots measure the first six months, when teams are auditioning for the policy. The long runs measure the steady state, when they are not.
What does not collapse in the long runs is the recruiting effect. Companies running a genuine four-day week — meaning thirty-two hours, full pay, no compressed Fridays — report measurable advantages in offer acceptance and in retention. These numbers are real. They do not require the productivity claim to be true.
The mistake firms make is selling the policy internally on the productivity story. When the productivity story stops being true at month nine, the policy looks broken, and the firm walks it back. The firms that keep it call it what it is: a four percent labour cost increase in exchange for a hiring and retention advantage that, in tight talent markets, more than pays for itself. That math holds. The productivity math does not.
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