Have a look at this article from the New York Times. It's not that we should become market experts but rather grasp, what I believe, DeLillo is saying about the hyper-globalized cyber-capital economy. These are the "experts" and they can't really explain what's going on anymore.
"While China was the first market to tumble, it was not clear what set off the selling. But once it began, it spread first to other Asian countries, then to Europe and the United States."Also, the Washington Post has a simple little graphic here showing the near immediate fluctuation in world markets yesterday. This is the piece about the cause and effect ofhe "Mexican Tortilla Crisis". Furthermore, I wrote an article last month which mentions the Tortilla Crisis. The piece is dealing with cause and effect which is pertinent to our discussion. Be warned, I'm no DeLillo and its blatantly political. Finally, here is a very good "chaos theory for beginners" which is all I could ever hope to understand.