Definitely someone can become rich without owning a business, you can just be a share holder in one this big companies, just fund your money to the company for them to use it to run there business doing this process your money is the one working for you not you working for your money you just seat back I wait for your returns.
Must have money before can buy a share in any company of your choice. If you don't have money you can't buy any shares, unless you have an inherited property from your family, which you can sell to get the money. However, capital is very necessary in any business you want to do, the kind of capital you put in a business or investment will determine the profits you get. No capital no profits, and it's not appropriate to depend on someone or take a loan to do business or investment because you don't really know the outcome of the investment or business you want to put the borrowed money on. Although must take the risk to make more money but it's very necessary to risk what you can afford to lose. If you do not have and you borrow then lose the money, you will probably be in a big trouble.