You can get a loan or save some money in a savings account. I'd say maybe a few thousand. It depends on what you want to invest in. I personally want to follow my parents foot steps onto real estate investing. I need a few thousand for the down payment and with the future equity I can buy more houses and invest some more. Money makes money.
'invest' corellates with compound interest: look up that definition if you don't know it already. The short of it is that the investment will ballon as yearly compounding takes over during the life of the investment of 30+ yrs (often to the point of dwarfing the initial investment).
However, in today's interest rates on 'investing' are no where near what they were 10, 20, 30 yrs ago.
Call an investment advisor and ask how much you would need to have before he would take you as a client.
That will give you some idea.
It depends how much money you want to invest but you should contact your broker to check what is minimum amount to open an account. You can start ivnesting few bucks in mutual funds using SIP too
Let's just say that you should have at least a few thousand to start off with. Anything less, and you'll only be earning dollars at most, unless you're patient and are willing to wait months.
10 grand, at least.
I had previously asked, how to get rich, and was told to invest, what do they mean by invest? and how much does it take to invest ? .__.