At the annual conference of the billionaires' trade union, the World Economic Forum, you couldn't grab a coffee without stumbling on a huddle of plutocrats wringing their hands about the devastating consequences of de-leveraging. They were bemoaning the end of the borrowing boom of the past decade, when a great bubble of debt was created. That bubble has been pricked. Those who lent to us want their money back, or to charge us more for the loans they'll continue to provide. It may be years before debt becomes as cheap or plentiful as it has been. The very structure of our economy will change.
Why talk about "de-leveraging" rather than say that the time has come for us to repay our debts? It's because those who got us into this mess, the bankers who lent all this money and trousered huge bonuses for doing so, have a powerful profit incentive not to see the world in sharp focus. They made fortunes finding clever ways of shifting the vast cash surpluses generated in the huge exporting economies of Asia, the Middle East and Russia into loans to western consumers and companies.
They did this by converting what we borrowed into complicated financial products with confusing names, such as collateralised debt obligations and collateralised loan obligations, and selling them to investors all over the world. They saw this process as the equivalent of the creation of the internet, as a technological revolution that built a gushing cash superhighway linking east to west. So here's Peston's law of economic cycles: a crash looms when brainy bankers talk impenetrable bollocks to disguise the risks they're running.
We saw that during the internet bubble of the 1990s. We've seen it in the insane euphoria of Wall Street and the City of the past few years. When bankers drop English for bollockese, we're all in trouble.
They lent trillions of dollars to individuals and businesses that could never repay it. The most conspicuous example was those sub-prime loans to ex-cons and former bankrupts who wanted to join the property-owning classes. But the bad lending went wider than that. The losses on those loans are shrinking the capital of our biggest banks and making them much more averse to taking risks. So they're de-leveraging and most of us will end up poorer.
When I moved from print to broadcasting a couple of years ago, I was unprepared for being objectified. Or, to put it another way, when you are on screen people feel it's OK to comment on your qualities in the kind of brutal way they would never do if you were in any other job. If you want a flavour of this, click on my blog (www.bbc.co.uk/robertpeston ), where you will find a choice selection of the wise, the blunt and the verbalised Glasgow kiss.
I quickly grew a rhino hide, and now think it's thoroughly healthy that licence-fee payers feel they own the BBC and have a mandate to give me advice. I only wish they had a similar sense of ownership over the companies they indirectly own through their pension funds. Our boardrooms would probably benefit if they had a stronger sense of the views of the millions of people they serve.
My book is about the vast fortunes generated by those who pumped up the debt bubble and about the naivety of the elite in the UK and US that encouraged this creativity. These themes are also explored in a BBC2 documentary I am making for early March.
The greatest challenge is coaxing billionaires and bankers when on camera to speak in a language their mums could understand. Many are incapable of doing so. But the great hedge-fund veteran, the trader who broke sterling, George Soros, is a lucid exception - as he is to almost all my anthropological rules about the behaviour of billionaires, formulated after years of observing them in their natural habitat.
I interviewed Soros on Saturday, and here is what was shockingly different. He turned up without an entourage or even a PR minder. He exhibited no pomposity. He was charm itself. And he spoke almost no bollockese.
Robert Peston is BBC business editor. His new book, "Who Runs Britain? How the Super-rich Are Changing Our Lives", is published by Hodder & Stoughton (£20)