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Why did the Swiss National Bank fix the EUR/CHF exchange rate at CHF 1.20?
Due to the issues in the Eurozone, many foreign investors were buying Swiss Francs as a hedge against a Euro devaluation. They were in effect treating the Franc like gold, silver or some other commodity with perceived intrinsic value. This causes huge problems from the Swiss, as the value of the Franc increased and their exports became more expensive for foreigners to purchase. Things were getting bad enough that the Swiss in some places were travelling to Germany to buy groceries! To enforce this "fixing" of the Franc, the Swiss Central Bank announced that they would buy foreign currency in unlimited quantities by printing Francs. In reality, just announcing that they were going to do this was sufficient to discourage foreign investors from loading up on Francs. NPR's Planet Money did a really good job covering this topic: