This might seem like an odd time to think about inflation. Gold prices have retreated from their prewar highs, with the cash bullion price threatening a breach of support at $319 per ounce. Crude oil prices have pulled back from their flirtation with $40 a barrel, the dollar has stabilized near 1.07 per euro, and bond yields are still scraping 40-year lows.

The economy is -- charitably -- sputtering, almost no industry is encountering production bottlenecks, and the growth of the monetary base is well within historical norms. Why worry?

As a wise man once said, "When there is not a cloud in the sky, be careful where you step."

On a more practical level, the 21-year bull market in bonds, which supported an 18-year bull market in stocks, will come to an end someday. When it does, look out.

The last bear market in bonds lasted for three decades. It didn't break until inflation was broken by the Reagan/Volcker combination of fiscal stimulus and monetary contraction, a policy mix advocated by Nobel laureate Robert Mundell.

They Shoot Bulls, Don't They?

Source: Bloomberg

Measuring Stick

A long-ago chemistry professor of mine posed a question: What is temperature? After about 20 minutes, he established to everyone's satisfaction that this common metric (cool word; we should use it to value industries we don't understand someday) that everyone understood intuitively was nearly impossible to define.

Inflation is similar.

The common indices, such as the PPI or the consumer price index, are bandied about by the eternally sophomoric, and their monthly announcement usually prompts an interesting parody of some Three Stooges slapstick in the bond futures pit, but they're poor measures of the underlying process. Neither recognizes the effects of technological improvement, price elasticity of demand, the dynamics of substitution or the impact of nonprice discounting. Technically, they're Laspeyres indices that measure the change in price of a fixed basket of goods and services.

The quarterly GDP deflator, which is announced too late and infrequently for Wall Street's if-I-don't-trade-something-soon-I'm-going-to-bust crowd, is a Paasche index, which measures the change in price, not of the original basket of goods and services, but of the final basket of goods and services. (As an aside, the Laspeyres index was developed way back in 1864, while the Paasche index is from 1874.)

Looking Ahead

But markets are supposed to look ahead at what is going to be, not behind at what was. The Economic Cycle Research Institute (ECRI) has developed a forward inflation gauge (FIG) that uses the Journal of Commerce materials price index; growth in real estate loans; the insured unemployment rate, treated on an inverse basis; the yield spread between the 10-year note and the six-month bill, also treated on an inverse basis; the growth rate in civilian employment; the growth rate in federal and nonfederal debt; the growth rate in nonfuel import prices; and the percentage of purchasing managers reporting slower deliveries.

If we're to believe that inflation is always and everywhere a monetary phenomenon (hint: it is), then the Federal Reserve's aggressive rate cutting of the past two years should give us pause. The steepness of the yield curve, here measured by the ratio of the forward rate between one and 10 years, the rate at which you can borrow for nine years starting one year from now, to the 10-year rate itself, has led the rise in the FIG by about two years.

Yield Curve & Future Inflation Gauge

Source: Bloomberg

TST Recommends

The FIG itself is higher than levels reached during the Fed's 1994-1995 rate increase campaign and is almost as high as it was after the Fed's 1999-2000 series of rate increases.

That we haven't yet seen an increase in inflation can be ascribed to a slowdown in commercial credit extensions.

While bank loans aren't as important as they once were to corporations -- many prime borrowers go directly to the commercial paper market -- they still reflect trends in the overall credit picture.

If we take commercial and industrial loans as a percentage of GDP, we find that this number is the lowest since the Eisenhower administration. Bank loans are a lagging indicator. They rise only after the economy recovers and slack capacity disappears, and they remain high once a recession starts to finance inventories.

Whatever Happened to Lending?

Source: Bloomberg

Once the economy turns higher (and it will someday), bank lending will recover and with it the rate of money supply growth. If the money supply grows faster than GDP, we have inflation.

Lack of Speed Kills

We know that inflation raises interest rates and kills bonds. Is there any sort of benefit to stocks? Only if an upturn in inflation is accompanied by an upturn in velocity, a process that requires continued strong growth in productivity. Monetary velocity, the ratio of GDP to M2, is a barometer for the overall level of risk acceptance in the economy. Lately it has been falling off a cliff as investors have been fleeing risk and moving toward the perceived safety of cash and bonds.

Unsafe at Lower Speed

Source: Bloomberg

Velocity has tended to lead equity prices by just 11 quarters. As risk acceptance increases, new ventures are formed, profits are generated and investors react. This process takes time. The continued plunge in velocity suggests we are a long way away from the beginning of this virtuous cycle.

Howard L. Simons is a special academic adviser at Nasdaq Liffe Markets, a professor of finance at the Illinois Institute of Technology, a trading consultant and the author of

The Dynamic Option Selection System. Under no circumstances does the information in this column represent a recommendation to buy or sell securities. The views expressed in this article are those of Howard Simons and not necessarily those of NQLX. As a matter of policy, NQLX disclaims the private publication of materials by its employees. While Simons cannot provide investment advice or recommendations, he invites you to send your feedback to

Howard Simons.

TheStreet.com has a revenue-sharing relationship with Amazon.com under which it receives a portion of the revenue from Amazon purchases by customers directed there from TheStreet.com.