Swiss exporters are warning are warning they may lose $5bn as a result of the shock abandonment of the cap on the Swiss franc against the euro.
The Swiss National Bank announced it was removing the cap on Thursday, having had it in place since September 2011.
It led to a sharp rise in the value of the Swiss franc, and a sharp fall in Swiss shares.
It's now feared many Swiss companies will struggle to maintain export levels in the face of a higher currency.
Laith Khalaf from stockbroker Hargreaves Lansdown says the move was a shock for businesses, markets and consumers.
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