def market_order(self, direction, quantity, **kwargs):
        """ Shortcut for ``instrument.order(...)`` and accepts all of its
        `optional parameters <#qtpylib.instrument.Instrument.order>`_

        :Parameters:
            direction : string
                Order Type (BUY/SELL, EXIT/FLATTEN)
            quantity : int
                Order quantity
        """
        kwargs['limit_price'] = 0
        kwargs['order_type'] = "MARKET"
        self.parent.order(direction.upper(), self, quantity=quantity, **kwargs)