Earlier quoted context omitted.
In the computer example, someone using the envelope system would decide not to buy the computer if the balance in the appropriate account was short. It’s just a different approach to timing and limiting purchases.
It still sounds a bit weird to me. If I need something, I will buy it unless I don't have cash for it. The concept of buying stuff just because I still have some spare cash in some bucket but I stop once bucket is empty feels so strange to me, some sort of forced self-check on compulsive buyers. If that's the case, I would rather look for solution in the root cause of such behavior rather than symptoms. Maybe the mot…
For some things those will be fixed monthly expenses (rent, insurance, mortgage. Others will be variable, like grocery shopping, maybe clothing. And others will be bigger purchases like a computer.
It's just another framework or set of tools for budgeting your money out into the future. YNAB (You Need a Budget) has some decent articles on their blog about the concept. Dave Ramsey might be helpful too if you really want to understand the motivation behind this kind of system.