By Ambrose Evans-Pritchard

LONDON, England - April 5, 2009 - Swiss consumer prices fell 0.4pc in March (year-on-year). Swiss CPI will be minus 1pc at least by July, nearing the level where spending psychology changes. By the time you have a self-feeding spiral, it is too late.

"This is something that we must prevent at all costs. The current situation is extraordinarily serious," said Philipp Hildebrand, a governor of the Swiss National Bank.

The SNB is not easily spooked. It is the world's benchmark bank, the keeper of the monetary flame. Yet even the SNB's hard men have thrown away the rulebook, taking emergency action to force down the exchange rate of the Swiss franc.

Here lies the danger. If other countries try to export deflation by this means, we will face a second phase of the global crisis. Taiwan is already devaluing. Korea, Singapore, and Sweden all seem tempted to follow. Japan is chomping at the bit.

"We don't fully realize in the West what a catastrophic collapse Japan has suffered," says Albert Edwards, global strategist at Société Générale. "The West has dumped a large part of its economic downturn onto Japan by devaluing against the yen."

This is about to go into reverse as Tokyo hits the ping-pong ball back across the net. "As the unfolding collapse in the yen gathers pace, the West will see its green shoots incinerated to dust," he said.