In the case of a fixed/pegged currency, the government of a country may, as is the case with China, determine the currency value through the central bank, while in other cases, like in Switzerland, it is the central bank (SNB) itself that pegs the currency to another currency or a basket of currencies, in relation to the trade volume with that country. The currency price for floating currencies is determined by market forces, such as supply and demand. These forces are heavily affected by the economic forecasts of a country, central bank activities, rhetoric and forecasts, politics, market sentiment etc., while technical factors determine whether that currency is overvalued or undervalued.