With heavily leveraged trading on forex ( http://en.wikipedia.org/wiki/Foreign_exchange_market ) , he can make 100 galleons into 100 000 galleons in one hour (with leverage of 0.2% you earn profits from trading of X, but you only need to really have 0.002 of X). And you can do this over internet, by a few back and forth trades that lasts for a few minutes.
With heavily leveraged trading on forex ( http://en.wikipedia.org/wiki/Foreign_exchange_market ) , he can make 100 galleons into 100 000 galleons in one hour (with leverage of 0.2% you earn profits from trading of X, but you only need to really have 0.002 of X). And you can do this over internet, by a few back and forth trades that lasts for a few minutes.
But you probably can’t do it over the Internet in 1991.
Oh, right.
It’s funny how we(I) take some things for granted.
Also, I think you need some credentials to be allowed even much less leverage. Of course, magic can help a lot with that.
He also has a father who teaches at Oxford. I suspect he could run stuff through Dad if that was the biggest stumbling block.