[TheHappyOddish]

> It seems more likely that people would retain a similar ratio of slacking to working.

Got it in one. Humans are creatures of habit. You (yes you, oh 10x HN reader) reading this may actually be hyperaware enough to analyse your weeks work and stuff it into 4 days, but I strongly suspect the vast majority of workers would coast the same amount (whatever that number may be) regardless of days worked.

[johnnyanmac]

Really depends on your lens here. You calling it "slacking" implies that you see this as purposefully avoiding work. A more optimistic lens suggests that it is mental burnout and general loss of productivity.

Either way, no one is expecting 100% productivity. Or at least, they shouldn't. The question is more on a long range than week by week. Does an employee with a 4 day work week require less days off? Will the motivated ones spend more time on growth with added free time? Will retention increase? These are less opaque factors that should be considered, even if modern corporate culture doesn't value them.