Correspondent Bart D. recently speculated that the U.S. stock market was now "too big to fail," that is, that it was too integral to the global financial system and economy to be allowed to fail, i.e. decline 40+% as in previous bubble bursts.

The U.S. stock market is integral to the global financial system in two ways. Now that investment banks, pension funds, insurers and multitudes of 401K retirement plans are dependent oncurrent equity valuations, a crash would impair virtually the entire spectrum of finance from hedge funds to banks to insurers to pension plans.

A decimation of these sectors would impact the U.S. economy and thus the global economy very negatively.

By turning the health of the economy into a reflection of the stock market, the Status Quo has made the stock market into the one bellwether that matters. In effect, the stock market is now integral to the economy as a measure of sentiment and evidence that all is well with the economy as a whole.

The stock market is now the signal everyone follows: if stocks are rising, we're told that means the economy is healthy. Conversely, if stocks decline sharply, the implication is the economy is weak.

In other words, it's not just valuations that make stocks integral to the economy and Status Quo–the market's signaling is now the key to sentiment.In economist Michael Spence's work, the information available to participants is asymmetric: roughly speaking, those on the "inside" have better information than those on the "outside."

The stock market addresses this asymmetry by signaling what's really going on via price: if the market sells off, that tells even those with little other information that all is not well in the economy.

A rising market sends the opposite signal: everything's going well. If the participant isn't experiencing good times himself, he will still defer to this signal, reckoning that his own financial stagnation is an anomaly rather than the norm.

This explains why a rising stock market is now essential to the Status Quo: if the market reverses, everyone who sees mostly stagnation in their corner of the economy will realize that is the norm, not a local aberration.