Monday's Wall Street Journal article, Muni Bond Costs Hit Investors in Wallet: Investors Pay Twice as Much for Municipal Debt as for Corporate Bonds, points out yet again that investors pay far more to buy and sell municipal bonds than they pay to buy and sell similar quantities of corporate bonds or common stocks. The article cites a recent S&P study that finds investors buying a $100,000 municipal bond pays an average spread of 1.73% or $1,730 - twice as much as the 0.87% average spread...