Work less. Spend less. Live more.

—chalked on a sidewalk at my college, years ago

I was reading economics at the time, so it made a lot of sense to cast the preference in terms of isoutility curves. As long as the level curves of 𝓤 over (consumption, leisure) space are sufficiently close to parallel the consumption axis, the above suggestion is rational, even optimal.

In terms of partial derivatives, 𝓤 / ∂leisure > ∂𝓤 / consumption at many points in (consumption, leisure) space. More to the point, the directional gradient along the budget constraint points leisureward even at the expense of consumption, for a meaningfully large fraction of the segment.

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