'Orders are always priced in USD'

def sell(self, amount, price):

    local_currency_price = self.fc.convert(price, 'USD', self.currency)
    logging.info(('Sell    %f    BTC    at    %f    %s    (%f    USD)    @%s' % (amount, local_currency_price, self.currency, price, self.name)))
    self._sell(amount, local_currency_price)
