First of all we have to know the amount of salary that people get at work so that we can make assumptions about the problem and usually the salaries of workers for different countries have different amounts.
Second find out about the cost of living in a country so that by relying on salary is it enough to meet their life and after that see the opportunities to achieve wealth by relying on salary.

Generally if you want to get wealth then someone must build a business, investment or other ways because relying on money from salary will definitely not be enough.
If you want to get wealth then having a business is an obligation or maybe you can also rely on more potential investments.