A key factor, he said, was the close relations among central bankers, which enabled them to coordinate market interventions.

The size of the market intervention was not immediately clear.

It can be reached by market intervention in a cost-effective manner.

All found it one of the hardest forms of market intervention.

It was a fear of market intervention by central banks that kept the dollar higher overseas, analysts said.

"But this would be market intervention to correct market distortions that exist."

This could provide an argument for sterilized foreign market intervention.

Short-term market intervention, they say, cannot alter a fundamental economic shift.

They should be replaced by clear-cut operating rules and limited, focused market intervention.

Developing models to simulate the effects of market intervention in the economy.