This is obviously a pretty incredible transformation. There are plenty of remarkable things about the whole situation but the one that strikes me the most is how this displays for all to see just how utterly impossible it is to predict the stock market. There are so many people out there with funds of various kinds that claim to be able to beat the market, to predict changes and trends and figure that they should find lots of folks and convince them of the ability of their fund to grow faster than anyone else's. Of course if you look at Ireland and the mess there it becomes entirely clear that nobody can predict the market. It is by far the most obscene and extreme situation I have seen where a single individual's decision warps world finances in ways no one could predict. How could you know whether or not those banks would collapse and be worthless or whether a country would take the fall for them? Moreover, how in the world could you predict the vagaries of such a complex system significantly better than all the other 'experts' out there who are trying to do the exact same thing? There are plenty of people and plenty of funds that beat the market, the trouble is in finding ones that can beat the market in a consistent, statistically meaningful way year after year, particularly since they don't exist.
There are plenty of other examples of course, particularly in the mess that occurred over the last few years. There are innumerable bank presidents, CEOs and fund managers who made decisions that destroyed companies, lost billions, or made fortunes. Not everyone lost money in the collapse as there were some people betting on it happening and they ended up richer than anything. (See the book The Big Short if you are interested, it is a fascinating look at how the collapse occurred and how a few people made a killing off of it.) No matter how big companies become, no matter how complex the system is, there are always opportunities for single people to make big decisions and shape the world, economically and otherwise. Because of that our ability to predict the sweep of future history is weak indeed.