19 of 20 Mutual Benefit
All business should be striving for situations of mutual benefit/profit and not be engaged in economic cannibalism.
This principle is in tune with the last 4, all are basically saying do not exploit. Don't exploit, your employer or employees, suppliers or customers. When you do business try and make your dealings be of mutual benefit, so that all those involved come out in front. That is not always possible, at times not even desirable, but such situations should be the exception and not the rule.
Upon Hope Blog - A Traditional Conservative Future