How much managers earn depends on lots of factors. Generally, larger companies pay higher salaries. Salaries vary by region and by industry. And, of course, it depends on what the management job is. For example, the CEO will be paid more than the assistant night manager.
Here are some articles to help you understand the different management job titles and determine whether or not management is a good career choice for you.
Also, you can look up median salaries for a variety of management and executive jobs
on Salary.com. You can search by title (alphabetically) and refine it by location. There are additional filters available, like industry, company size, etc., but they require a free registration to access.