Your One Number covers everything you need to live—and I do mean everything. I’m talking about: Electricity and other utilities Food Clothing Cars Vacations Electronics Credit card debt College tuition Hobbies And anything else you want or need. Instead of worrying about every little receipt, you just have to make sure your total monthly spending falls within your One Number. That’s it. If you can do that, everything else automatically works, and your wealth building for retirement is taken care of.