The Swiss franc is normally seen as a safe haven currency. Thus, during times of global instability, the Swiss franc becomes a highly demanded currency. Therefore, it will appreciate in value in relation to the USD. Therefore, traders should sell (Bid) the USD/CHF. On the other hand, during times of stability, the demand for the US dollar will increase as people will see less need for parking their money in Swiss franc as a safe haven currency.
In this situation, traders will buy (Ask) the USD/CHF as the US dollar continue to strengthen against the Swiss franc.
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