Comment by ssivark

To expand on this: rent is a manifestation opportunity cost for a gated resource. So one person lounging around drinking coffee is no more judged on their activity in and of itself, but compared to the other "industrious" person who might have taken their place and been more productive. This is why marginal spaces/resources not being optimized for economic output are so important to exploratory and risky endeavors: https://paulgraham.com/marginal.html