George Soros (and a lot of other hedge funds) famously did this to the European Exchange Rate Mechanism in 1992, blowing the United Kingdom and Italy out of the system. Soros could do this because he knew that there was no way the United Kingdom or Italy could be as competitive as Germany without serious price deflation to increase cost competitiveness, and that there would be only so much deflation and unemployment these countries could take before they either ran out of foreign exchange reserves or lost the next election. Indeed, the European Exchange Rate Mechanism was sometimes referred to as the European “Eternal Recession Mechanism,” such was its deflationary impact. In short, attempts to maintain an anti-inflationary currency peg fail because they are not credible on the following point: you cannot run a gold standard (where the only way to adjust is through internal deflation) in a democracy.

Mark Blyth, Austerity, loc. 214