While not quite as frothy, home prices are now moving up for all the wrong reasons. The seminal Case-Shiller Index of home prices is now up for the fourth month in a row. The index's designer, Professor Robert Shiller, has stated recently that the current upward trajectory is unsustainable. In fact, the levels are still above the 50 and 100 year trend lines.

In the worst economic climate since the Great Depression, and after the largest housing bust on memory, single-family home prices should be falling well below the trend lines. But with a doubling of the monetary base and special interest programs like the homebuyers' tax credit, home prices have stabilized and even increased in some markets. That's the work of inflation.

With GDP growth now returning to positive territory, many inflation hawks ask why inflation has yet to truly manifest. The explanation can be found in the difference between monetary base and money supply.

The latest $1.9 trillion injection of government money was composed of some $900 billion of stimulus, of which only about 20 percent has been distributed. However, in its attempts to stabilize the financial system, the government has already spent some $1 trillion of TARP-type funds.

The TARP money, financed by an increase in the monetary base, has been provided to the banks at zero cost. And for the first time ever, the Fed is paying interest on bank reserves. Therefore, the banks can loan money to the Fed and to the government, via Treasury securities, at an interest rate spread of some 3 to 4 percent without risk. Given these incentives, it makes no sense to loan to anybody else. So, despite a massive increase in the monetary base, credit remains tight and price levels flat.

However, if the Fed stops paying interest on bank reserves or otherwise ‘persuades’ the banks to lend, the $1 trillion will be leveraged up by the banks and spewed out into the economy. Fractional reserve banking will transform a $1 trillion monetary base injection into a $9 trillion increase in money supply. When that happens, prices for everything will go through the roof.

So for now, inflation is like a ninja stalking our economy. It’s lurking in the shadows but can’t easily be seen. But once its strikes, it will be fast and deadly.