Research shows that by enhancing visibility, advertising improves stock liquidity and returns. Unlike stock holders, bond holders may view advertising skeptically. Without proven effectiveness in improving revenues, large pre-interest advertising expenditures can be seen as eroding a firm's ability to meet its debt service obligations. We find that although greater advertising by a firm improves liquidity of its bonds in the market, it does not lower the firm's cost of debt. However, firms with ineffective advertising experience reduced bond market liquidity and a higher cost of debt. Without a real positive economic impact, advertising has little or no value for bond investors.