The debated on financial reform as summarized by Krugman in his latest piece in the NYT seems to have boiled down to the Volker position of limiting the size of financial institutions so that they do not reach a too big to fail size or the position of Krugman of tight and generalized regulation of Banks and shadow banks.
It seems to me that both analysis miss the simple but central ingredient needed to secure the financial system while not impending economic growth and that is a centralized clearing of all trades. Centralized clearing by nature remove a lot of the incentives in the buildup of too big to fail financial entities, it brings a level of transparency that all times gives regulator a clear picture of the dangers in the positions taken by financial/ economic actors.
A simple example to illustrate the power of centralized counterparty on trades. When you go online to buy an item or at the to a store and you use a credit card, that transaction is facilitated and secured by the existence of a centralized counterparty who keeps track of your assets and liabilities and authorize the transaction only when you have enough credit. No party to the transaction takes credit risk on the other and the system is robust. If the same worked among financial trading institutions the same efficiency and security would be gained, eliminating much of the systemic risks that are the source of current concerns.
See:
http://www.nytimes.com/2010/04/02/opinion/02krugman.html?src=me&ref=general
The Holistic Theorem
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