A Premium Multiple is Hard to Come By and Harder to Keep;  Owners Should Worry More About Improving Performance  Susan Nolen Foushee, Tim Koller, and Anand Mehta make the case in McKinsey Quarterly that executives considering company value often worry too much about their company’s multiple (e.g., a P/E ratio, or EV/EBIDTA, etc.) instead of focusing on company growth.   It isn’t that multiples aren’t legitimate data to consider.  But multiples can vary widely if a company is comparing itself to the wrong set of competitors.  Multiples legitimately vary considerably based on the leverage a company is currently using and…