Milton Friedman, December 1997:
Defenders of the Bank of Japan will say, “How? The bank has already cut its discount rate to 0.5 percent. What more can it do to increase the quantity of money?”
The answer is straightforward: The Bank of Japan can buy government bonds on the open market, paying for them with either currency or deposits at the Bank of Japan, what economists call high-powered money. Most of the proceeds will end up in commercial banks, adding to their reserves and enabling them to expand their liabilities by loans and open market purchases. But whether they do so or not, the money supply will increase.
There is no limit to the extent to which the Bank of Japan can increase the money supply if it wishes to do so. Higher monetary growth will have the same effect as always. After a year or so, the economy will expand more rapidly; output will grow, and after another delay, inflation will increase moderately. A return to the conditions of the late 1980s would rejuvenate Japan and help shore up the rest of Asia.
via Friedman’s Japanese lessons for the ECB « The Market Monetarist.
Friedman was suggesting that the BOJ implement QE to boost the money supply and create inflation. Inflation would rescue the banks and real-estate-owners with underwater mortgages.