The leaders who improve the fastest tend to share a simple habit: they study their own results with the same care they bring to studying their market, their competitors, and their customers. That habit is easy to lose after twelve months shaped by inflation, shifting trade policy, and rapid changes in technology, when the pressure to move on to next year’s plan crowds out any real look at this one. When it slips, the same mistakes tend to reappear in new forms, and the hard-w