There are services (e.g. Bitpay) which remove the currency risk for the seller. The seller can set their price in US $ or whatever and receive the payment in th

There are services (e.g. Bitpay) which remove the currency risk for the seller. The seller can set their price in US $ or whatever and receive the payment in that currency while the purchaser has the option to pay in bitcoins at the going rate at the time.