British economists gave her a three page answer. The Guardian wants to see if its readers can answer it in three sentences. Here's my attempt:
Predictable financial crises do not occur because it is profitable for private businesses to act on any information that may lead to a financial crises. Whether it's recognizing there is a surplus of housing or that borrowers and lenders are overburdened, the lack of information is what caused today's problems. Governments can remove the uncertainty they bring and economists can improve their ability to predict market crises, but then again if they did prevent anything you would never notice.