Ben Bernanke is still chair of the Federal Reserve for at least another week, and yesterday he spoke out about US banks' need for more money. So as the debate over fiscal policy and the stimulus package continues to rage, monetary policy is still part of the game. Bernanke says he is in favor of a massive stimulus package, and he is supporting President Bush's call--in cooperation with President-elect Obama--for Congress to release the remaining funds in TARP. But he warns that the federal government needs to aid the banks, regardless of how unpopular that may be. From the New York Times : Though the Fed chairman acknowledged that people in many countries were “understandably concerned” about pumping government money into the financial industry while often turning a cold shoulder to other sectors, he defended the effort as unpleasant but necess ary. “This disparate treatment, unappealing as it is, appears unavoidable,” he said. “Our economic system is critically dependent on the free flow of credit, and the consequences for the broader economy of financial instability are thus powerful and quickly felt.” So as much as it seems there is a battle between a monetary policy camp and a fiscal policy camp--see Daniel Gross's Moneybox column today at Slate--Bernanke reminds us that we may not be able to have one without the other. Martin Wolf's Economists Forum over at the Financial Times has provided great insight into understanding monetary policy tools. Today Wolf goes Down Under for some thoughts on Zero Interest Policy (ZIP) from Stephen Greenville of the Lowy Institute in Sydney. Greenville is a former deputy-governor of the Australia Fed and he looks at the question of whether , with central bank rates at or near zero, monetary policy has "become impotent in the US and Japan?" While the zero bound leaves no room for further shift in interest rates, at the same time it removes a constraint on central bank operations. Normally they have to balance the money market each day through open market operations, supplying the public with the currency it wants to hold and giving the banks a comfortable level of reserves. This is usually a fairly routine process, supporting the official interest rate setting. But with interest rates at zero, the authorities can push out as much base money as they want to - quantitative easing (QE) is the name of the game. In itself, more base money may not do much: it just accumulates in bank balance sheets (as happened in Japan in 2001-2005 and is happening now in the US). But the central bank can use base money to buy longer-dated government paper, pushing down the yield curve, partially addressing the first problem mentioned above. More powerfully, it can buy private sector assets. Buying undervalued assets not only helps to unclog illiquid markets, it also adds capital to the balance sheets of those who hold these undervalued assets, as the price is bid up. That said, don't put Greenville in the camp that thinks monetary policy has enough juice to be effective at this stage. Certainly, let’s use the opportunity to fix infrastructure through fiscal expansion. But how do you shrink the house-of-cards which is the financial sector, without bringing the whole lot down? While this necessary contraction is happening, how to maintain the flow of essential funding to good enterprise? How to distinguish between good and toxic assets, when the “lemons” problem is ubiquitous? All this requires micro-level banking analytical skills, which seem to have atrophied. At the macro level, using ZIP to signal that money has no time value might be appropriate, but it doesn’t do much to address these micro-issues. A zero interest rate (or even one with a risk premium on top of this) is a low hurdle-rate for new investment proposals to jump. Whatever is holding back demand now, it isn’t the level of interest rates: we shouldn’t waste too much energy regretting America’s inability to lower interest rates further. You can read Greenville's full article here .