David Wessel says the U.S. is in a liquidity trap. He says the 500 point drop in the Dow Jones Industrial Averages was a less significant event than the decision by the Bank of New York Mellon to charge clients for keeping large amounts of cash. In a liquidity trap investors are indifferent between keeping their money in cash or in investments providing a return, because interest rates are so low. Today the S&P 500 have in total an estimated $963 billion in cash. The solutions for gettting out of a liquidity trap include government stimulus spending, devaluing the currrency, and generating inflation that could make it easier to reduce government debt. The stimulus approach was adopted in the first 2 years of the Obama administration and there are now increasing pressures to reduce the U.S. deficit. Because of the role of the U.S. dollar as an international currrency and large sovereign holdings of U.S. currency, an outright devaluation of the dollar has not been considered an option. At the same time the weakening of the U.S. currency has helped exports and is encouraged by the Fed and the U.S. government. In a sense all three options are being tried in different degrees and ways. The stimulus was the early response till the deficit concerns began to increase and require attention, the efforts to lower the value of the dollar to increase exports is underway, and the rounds of quantitative easing by the Fed were intended to produce inflation (and avert deflation). All with limited success....