Of course a big capital in able to create a big idea. Having big idea but don't have enough capital to make the idea reality, it will remain idea. Or you can make your idea reality but not exactly the whole idea. What i mean is you make it partly not as a whole then when it click then it is for the future renovation or adjustment.
If thats the case, then you must read about how Facebook was established. How all the giant companies including big names like Google, Microsoft, Apples, Sony and many more got started by their owners? An idea can change the world. Lets look at the present idea, bitcoin is an idea and because it was according to the need of present people, it got support from all over the world.