In this paper we give a financial justification, based on non arbitrage conditions,of the (H) hypothesis in default time modelling. We also show how the (H) hypothesis isaffected by an equivalent change of probability measure.[...]

In OTC bond markets many investors face high costs of trade, and these costs appear to berelated to the lack of price transparency. We study the consequences this has for efficient pricediscovery. Prices of municipal bonds react sluggishly to macroeconomic news. Yield spreads overtreasuries...