Even if you know the industries that will grow exponentially, it doesn't guarantee stock success. I've just recently seen an episode of Haven, where one guy gets sent into the past and tells his grandpa to "invest in the microprocessor". I immediately thought "what does that mean?! Invest in Intel...or VIA?". What he said would is no different than saying a few years ago "invest in smartphones".
So if I tell you nanotechnology, biotechnology and 3d printing are "the future", in which company do you invest now?
I don't know if you're right about this. If you know which industries will beat the market at large, then you could make money by getting a loan and investing it in that industry, spread across all the companies, and weighted by doing some due diligence on the companies (basic financials, how close they are to mass market, team, product-market fit, etc)
So if I tell you nanotechnology, biotechnology and 3d printing are "the future", in which company do you invest now?