The reason is fairly simple
and was covered by the beeb recently
What us brits have been good at doing is coming up with the brilliant idea.
The wine glass with the inbuilt cooling system to keep your wine at exactly the right temperature for example.
However , you now want to manufacture said wine glass, so you goto the bank for a loan and the bank says "far too risky, pissoff, we've got some AAAA rated sub-prime morgages to buy"
So you goto the next source of funding, the stock market.
Someone says "good idea, I'll risk 10 million on this venture in return for 49% of the shares"
5 months later said wine glass is now a world beater, sales are up 200% on last week, profits are coming in, another factory has been built , again by issuing shares on the stock market.
Original backer notices his shares are now worth 20 million... time to cash in, other share owners also decide its time to cash in.
Suddenly, the guy with the idea realises he does'nt own the company any more, the shareholders force a hostile takeover, chuck him out and re-locate the factories to the far east in order to increase profits, then a US mega corp already making wine glasses buys up all the shares and stores the profits in the Cayman islands.
Inventor looks at the results and says "wow that was a wild 8 month ride" and tries to start again.
And gets sued out of business by the US mega corp.