All businessman are dependent on two person :
1) Customer
2) Employee
1) Customer Dependency
Lets think about a Businessman of eCommerce Industry (as I am related to this industry).
There are many eCommerce websites available in web world like ebay, amazon, flipkart, my favorite one infibeam.com and many other sites. Entrepreneurs of all these sites have power to make their own decision on development of their site. They can ask their employees to develop as per their requirement. But they have to be dependent on their customer. They have to satisfy their customers by providing products with good quality on time. If they start giving bad quality of products to customers or if they delay in shipping products to customer, this may cause lot of problems like loosing customer, if customer is too much smart then he will start tweeting on twitter or reviewing about the sites on review sites like mouthshut.com or on social networking sites. This can make bad impression to other customers.
Some eCommerce companies have started selling their own products like Amazon Kindle, Infibeam Pi. Here they need to maintain quality of their products. If quality of product goes down customer will start speaking against the company.
Now a days people are too much smart. Before buying any product from any company they are checking reviews of the products from other review sites. If review of the particular site is good then and then they will go for buying on that site. So if review is bad then you can understand what will happen to business.
So here in this case businessmen of the eCommerce domain has to be dependent on customer.
2) Employee Dependency
For growing business, an businessman need to have some or huge amount of employees. For this they need to conduct interviews and give good amount of salary to the employees.
Now if a businessman thinks about own self in place of their employees. And if he dissatisfies his employees by not giving salary or appraisal on time and lot many other factors. If he does this with one or two person then it is OK but when this happens to many then this will cause big dissatisfaction amount. Employee will start giving less output then decided and will start finding other job opportunity. And this may lay down the business. As one will stop giving particular output or leave the job. If he leaves the job then it might be better as you can find alternative of him (this is also time consuming process) but if he starts giving less output then this may cause bigger problem. And if you try to suspend that less working employee this might create bad impression with other employees as you had not satisfied him and now removed him from office. So it would be better to keep your employee happy and satisfy their requirements (not all but which are possible from your end).
So in this scenario you are dependent on your employee.
There is one more scenario in which you are dependent of government. For starting your business or getting projects from many area you need to be dependent on government. Sometimes you need to give (or keep giving) bribe (on time) to government persons for your business. If you stop it this may cause many problems and if I am not wrong you can understand those problems.
So if you think that you'll be independent after starting business then it is wrong. I am not saying don't start your business. Starting a business is the best way of earning. You will have power, money and many other powerful things after starting own business but you need to be dependent on many factors.