All financial markets are, from time to time, victims of media stories saying that liquidity has dried up. Or the obverse of the coin: sellers are overwhelming the supply of buyers. One example: For decades, scaremongers have described the disaster which would follow liquidation of the hoard of Treasurys held by Japan or China, but in the currency instabilities of the last year, a couple of trillion-worth have been sold to defend overseas currencies from an overstrong dollar — with no noticeable harm here at all.