Let me quote from a speech that Lawrence Summers, then deputy Treasury secretary (and now the Obama administration’s top economist), gave in 1999. “If you ask why the American financial system succeeds,” he said, “at least my reading of the history would be that there is no innovation more important than that of generally accepted accounting principles: it means that every investor gets to see information presented on a comparable basis; that there is discipline on company managements in the way they report and monitor their activities.” And he went on to declare that there is “an ongoing process that really is what makes our capital market work and work as stably as it does.”

So here’s what Mr. Summers  and, to be fair, just about everyone in a policy-making position at the time  believed in 1999: America has honest corporate accounting; this lets investors make good decisions, and also forces management to behave responsibly; and the result is a stable, well-functioning financial system.

What percentage of all this turned out to be true? Zero.

What was truly impressive about the decade past, however, was our unwillingness, as a nation, to learn from our mistakes.

Even as the dot-com bubble deflated, credulous bankers and investors began inflating a new bubble in housing. Even after famous, admired companies like Enron and WorldCom were revealed to have been Potemkin corporations with facades built out of creative accounting, analysts and investors believed banks’ claims about their own financial strength and bought into the hype about investments they didn’t understand. Even after triggering a global economic collapse, and having to be rescued at taxpayers’ expense, bankers wasted no time going right back to the culture of giant bonuses and excessive leverage.

Then there are the politicians. Even now, it’s hard to get Democrats, President Obama included, to deliver a full-throated critique of the practices that got us into the mess we’re in. And as for the Republicans: now that their policies of tax cuts and deregulation have led us into an economic quagmire, their prescription for recovery is  tax cuts and deregulation.

So let’s bid a not at all fond farewell to the Big Zero  the decade in which we achieved nothing and learned nothing. Will the next decade be better? Stay tuned. Oh, and happy New Year.