Going forward, asset purchases and lending programs could be expanded and extended to additional sectors impacted by the credit crunch. As for the comparison to Japan's experience, to my mind, the differences outweigh the similarities. Roughly speaking, the Fed is focused on the potential for targeted programs on the "asset side" of its balance sheet to improve credit flows in specific impaired markets, whereas the Bank of Japan was primarily focused on the potential for an expansion of the total quantity of its liabilities—the excess reserves of the banking system—to spur additional bank lending.

Evans said that based on the outlook for rising unemployment, falling industrial production and a wider output gap, economic models suggest rates should be below zero.

"If it were not constrained by zero, those models would want to push it below zero, but that's not possible," Evans told reporters after a panel at the American Economic Association's meeting in San Francisco.

Quantitative easing, a way to flood the banking system with large amounts of money, "is a way to mimic below-zero rates and provide support to the economy," he said.

As reprted by Reuters.

You will note that the emphasis of our activities has been on expanding the asset side of our balance sheet—the left side, which registers the securities we hold, the loans we make, the value of our swap lines and the credit facilities we have created. We feel this is the correct side to emphasize. The right side of our balance sheet records our holdings of banks’ balances, Federal Reserve Bank notes or cash (currently over $830 billion) and U.S. Treasury balances.

When the Japanese economy went into the doldrums, the Bank of Japan emphasized the right side of its balance sheet by building up excess reserves and cash, only to find that accumulation did too little to rejuvenate the system.

As I said earlier, in times of crisis many feel that the best position to take is somewhere between cash and fetal. But it does the economy no good when creditors curl up in a ball and clutch their money. This only reinforces the widening of spreads between risk-free holdings and all-important private sector yields, further braking commercial activity whose lifeblood is access to affordable credit. We believe that emphasizing the asset side of the balance sheet will do more to improve the functioning of credit markets and restore the flow of finance to the private sector. In the parlance of central banking finance, I consider this a more qualitative approach to “quantitative easing.” It is bred of having learned from the experience of our Japanese counterparts.

Expanding the provision of liquidity leads also to further expansion of the balance sheet of the Federal Reserve. To avoid inflation in the long run and to allow short-term interest rates ultimately to return to normal levels, the Fed's balance sheet will eventually have to be brought back to a more sustainable level. The FOMC will ensure that that is done in a timely way. However, that is an issue for the future; for now, the goal of policy must be to support financial markets and the economy.

You can see the size and breadth of the Fed’s efforts to counter the collapse of the credit mechanism in our balance sheet. At the beginning of this year, the assets on the books of the Fed totaled $960 billion. Today, our assets exceed $1.9 trillion. I would not be surprised to see them aggregate to $3 trillion—roughly 20 percent of GDP—by the time we ring in the New Year. The composition of our holdings has shifted considerably. Previously, almost 100 percent of our holdings were in the form of core holdings of U.S. Treasuries; today, less than a third are. The remainder consists of claims deriving from our new facilities.