I've always struggled with this thinking. Yes, you have finite hours in a day and if you spend an hour going to get food then you can't necessarily also be doing freelance work. But if you planned on working 8 hours to earn X dollars, you can still work 8 hours after spending an hour going to get food and still make X dollars. Sure, that hour has to come from somewhere so maybe it's lost leisure time or an hour of sleep. I guess it makes sense if you're trying to work every waking moment; and I can appreciate that some choose to and some have to.

> Sure, that hour has to come from somewhere so maybe it's lost leisure time or an hour of sleep.

Well, if you value an hour of your sleep or entertainment less than $15 dollars (if, for instance, you like to cook), then sure, spend it on cooking instead. Many of people would rather not, and their revealed preferences show it pretty clearly.