The problem is that spending money also spends time, whereas spending time does not also spend money. Hypothetically, if as a one person startup, spend $1000 o

The problem is that spending money also spends time, whereas spending time does not also spend money. Hypothetically, if as a one person startup, spend $1000 on rent and $1000 on food a month, and can expect to work 8 productive hours a day every day in a month (Just imaginary numbers here!) That means we have an hourly cost of about $8 dollars an hour. Which is to say, for every 8 dollars you spend you have one less hour of time. P.S the counter intuitive property of looking at it like this, is that if you are spending more monthly, it also takes more money to loose an hour. But this is due to the fact that you have fewer hours to start with, and thus each hour is worth more.