In the Middle Ages, the call for a crusade to conquer the Holy Land was met with cries of “Deus vult!” - God wills it. But did the crusaders really know what God wanted? Given how the venture turned out, apparently not.

Now, that was a long time ago, and, in the areas I write about, invocations of God’s presumed will are rare. You do, however, see a lot of policy crusades, and these are often justified with implicit cries of “Mercatus vult!” .- the market wills it. But do those invoking the will of the market really know what markets want? Again, apparently not.

And the financial turmoil of the past few days has widened the gap between what we’re told must be done to appease the market and what markets actually seem to be asking for.

To get more specific: We have been told repeatedly that governments must cease and desist from their efforts to mitigate economic pain, lest their excessive compassion be punished by the financial gods, but the markets themselves have never seemed to agree that these human sacrifices are actually necessary. Investors were supposed to be terrified by budget deficits, fearing that we were about to turn into Greece - Greece I tell you - but year after year, interest rates stayed low. The Fed’s efforts to boost the economy were supposed to backfire as markets reacted to the prospect of runaway inflation, but market measures of expected inflation similarly stayed low.

How have policy crusaders responded to the failure of their dire predictions? Mainly with denial, occasionally with exasperation. For example, Alan Greenspan once declared the failure of interest rates and inflation to spike “regrettable, because it is fostering a false sense of complacency.” But that was more than four years ago; maybe the sense of complacency wasn’t all that false?

All in all, it’s hard to escape the conclusion that people like Mr. Greenspan knew as much about what the market wanted as medieval crusaders knew about God’s plan - that is, nothing.

In fact, if you look closely, the real message from the market seems to be that we should be running bigger deficits and printing more money. And that message has gotten a lot stronger in the past few days.

I’m not mainly talking about plunging stock prices, although that’s surely telling us something (but as the late Paul Samuelson famously pointed out, stocks are not a reliable indicator of economic prospects: “Wall Street indexes predicted nine out of the last five recessions!”) Instead, I’m talking about interest rates, which are flashing warnings, not of fiscal crisis and inflation, but of depression and deflation.

Most obviously, interest rates on long-term U.S. government debt - the rates that the usual suspects keep telling us will shoot up any day now unless we slash spending - have fallen sharply. This tells us that markets aren’t worried about default, but that they are worried about persistent economic weakness, which will keep the Fed from raising the short-term interest rates it controls.

Interest rates on much European debt are even lower, because Europe’s economic outlook is so bad, and we’re not just talking about Germany. France is currently in conflict with the European Commission, which says that the projected French deficit is too big, but investors - who are still buying French bonds despite a 10-year interest rate of only 1.26 percent - are evidently much more worried about European stagnation than French default.

It’s also instructive to look at interest rates on “inflation-protected” or “index” bonds, which are telling us two things. First, markets are practically begging governments to borrow and spend, say on infrastructure; interest rates on index bonds are barely above zero, so that financing for roads, bridges, and sewers would be almost free. Second, the difference between interest rates on index and ordinary bonds tells us how much inflation the market expects, and it turns out that expected inflation has fallen sharply over the past few months, so that it’s now far below the Fed’s target. In effect, the market is saying that the Fed isn’t printing nearly enough money.

One question you might ask is why the market’s pro-spending, print-more-money message has suddenly gotten louder. My guess is that it’s mainly driven by events in Europe, where the slide into deflation and the growing public backlash against austerity have reached a tipping point. And it’s very reasonable to worry that Europe’s problems may spill over to the rest of us.

In any case, the next time you hear some talking head opining on what we must do to satisfy the markets, ask yourself, “How does he know?” For the truth is that when people talk about what markets demand, what they’re really doing is trying to bully us into doing what they themselves want.