When a company is struggling, one of the first reactions is to look at market forces to see whether they are a factor. When they are not, many companies are at a loss to explain the problems and find solutions. Chris Zook is a partner at Bain & Co., a management consultant firm, and served as co-head of its Global Strategy Practice for 20 years. In his new book with James Allen, The Founder’s Mentality: How to Overcome the Predictable Crises of Growth , he draws on his decades of experience to demystify the secrets of companies that push themselves past a slump. Zook spoke about his book on  the   Knowledge at Wharton Show on Sirius XM channel 111 . An edited transcript of the conversation follows. Knowledge at Wharton: In the notes that come with the book, you wrote that “growth creates complexity, and complexity is the silent killer of growth.” What does that mean? Chris Zook: The early years of a company, the founder years, are almost like a single-celled animal in biology.…