1. Paycheck to paycheck. Includes constant worry and frustration about living expenses and basic necessities. Any unexpected cost will lead to not being able to pay the bills. Money is on your mind 24/7, life in this category is hell. Very difficulty to escape this category once you fall into it.
2. Able to afford living expenses with a little left over. I guess you'd call this middle class? Or maybe upper lower class. These people have an income that lets them pay their bills without worry, so they have a cushion of a few hundred/thousand dollars a month. These people don't experience stress over standard bills anymore, they are free to enjoy living life a bit fancy. Can go out to eat at good restaurants, can afford to do miscellaneous activities.
3. Anything above #2 really. This is the bracket and beyond that has plenty of income in that expenses don't matter anymore. Stress about affording living expenses is non-existent.