Former Fed Chair Alan Greenspan made his highly anticipated appearance before the Financial Crisis Inquiry Commission yesterday, and he said that yes, interest rates were a problem, but not because of his policy: The house price bubble, the most prominent global bubble in generations, was engendered by lower interest rates, but, as demonstrated in the Brookings paper I previously provided to the Commission, it was long term mortgage rates that galvanized prices, not the overnight rates of central banks, as has become the seeming conventional wisdom. That should not come as a surprise. After all, the prices of long-lived assets have always been determined by discounting the flow of income (or imputed services) by interest rates of the same maturities as the life of the asset. No one, to my knowledge, employs overnight interest rates—such as the Fed Funds rate—to determine the capitalization rate of real estate, whether it be the cash flows of an office building or the imputed rent of a single-family residence. As I note in the Brookings paper, by 2002 and 2003 it had become apparent that, as a consequence of global arbitrage, individual country long term interest rates were, in effect, delinked from their historical tie to central bank overnight rates. You can read Greenspan's prepared statement here . And here is a Reuters report on his testimony: FCIC Chair Phil Angelides pressed Greenspan on the Fed's handling of the subprime problem. But Greenspan seemed to duck any suggestions that his policy should have been different. Here's a clip of that exchange (thanks to Huffington Post): C-Span has video of all of yesterday's proceedings. Watch it here .