In a BIS working paper (January 2015), Bengt Holmstrom summarizes some of the implications of the research on information insensitive debt. He cautions against moves to increase transparency in debt markets and defends the shadow banking system. He explains why opacity and information insensitivity are valuable and argues that debt-on-debt arrangements are (privately) optimal.
It all started with pawn shops:
The beauty lies in the fact that collateralised lending obviates the need to discover the exact price of the collateral. …
Today’s repo markets … are close cousins of pawn brokering with similar risks for the parties involved. … the buyer of the asset (the lender) bears the risk that the seller (the borrower) will not have the money to repurchase the asset and just like the pawnbroker, has to sell the asset in the market instead. The seller bears the risk that the buyer of the asset may have rehypothecated (reused) the posted collateral and cannot deliver it back on the termination date. … the risk that a pawnbroker may sell or lose the pawn was a big issue in ancient times and could explain why the Chinese pawnbrokers were Buddhist monks. …
People often assume that liquidity requires transparency, but this is a misunderstanding. What is required for liquidity is symmetric information about the payoff of the security that is being traded so that adverse selection does not impair the market. …
… stock markets are in almost all respects different from money markets …: risk-sharing versus liquidity provision, price discovery versus no price discovery, information-sensitive versus insensitive, transparent versus opaque, large versus small investments in information, anonymous versus bilateral, small unit trades versus large unit trades. … money markets operate under much greater urgency than stock markets. There is generally very little to lose if one stays out of the stock market for a day or longer. This is one reason the volume of trade is very volatile in stock markets. In money markets the volume of trade is very stable, because it could be disastrous if, for instance, overnight debt would not be rolled over each day. …
… debt-on-debt is optimal … . It is optimal to buy debt as collateral to insure against liquidity shocks tomorrow and it is optimal to issue debt against that collateral tomorrow. In fact, repeating the process over time is optimal, too, so debt is in a very robust sense the best possible collateral. This provides a strong reason for using debt as collateral in the shadow banking system. …
Panics always involve debt. Panics happen when information insensitive debt (or banks) turns into information-sensitive debt.