The most common trap for small business owners is chasing revenue growth while letting margins erode. I saw it first-hand in my family's business years ago: we hire more people, add headcount, and watch payroll balloon, thinking that more people means a more output. But the real path to sustainable business growth is protecting (and growing) margins first and foremost. And the single best metric I have found that that captures this is... (drumroll please): Gross Profit per Employee. This is...