Central banks on both sides of the Atlantic are actively engaged in discussions about the feasibility of mass purchases of mortgage-backed securities as a possible solution to the credit crisis.

Such a move would involve the use of public funds to shore up the market in a key financial instrument and restore confidence by ending the current vicious circle of forced sales, falling prices and weakening balance sheets.

The conversations, part of a broader exchange as to possible future steps in battling financial turmoil, are at an early stage. However, the fact that such a move is being discussed at all indicates the depth of concern that exists over the health of the banking system.

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It shows how far the policy debate has shifted in recent weeks as the crisis has spread to prime mortgage assets in the US and engulfed Bear Stearns, the investment bank.

The Bank of England appears most enthusiastic to explore the idea. The Federal Reserve is open in principle to the possibility that intervention in the MBS market might be justified in certain scenarios, but only as a last resort. The European Central Bank appears least enthusiastic.

Any move to buy mortgage-backed securities would require government involvement because taxpayers would be assuming credit risk. There is no indication as yet that the US administration would favour such moves. In the eurozone it would require agreement from 15 separate governments.

One argument among policymakers and bankers has been that new international rules have exacerbated the credit squeeze by requiring assets to be valued at their current record lows rather than at face value.

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