This book explains what factors may influence business cycle life stages. Why can some businesses experience growth life cycle stage, then going to mature life cycle stage rapidly? Otherwise, some businesses need long time to experience growth and mature life cycle stages. What factors may influence the business may reach growth life cycle stage and mature life cycle stage? Why does some businesses experience decline life cycle stage rapidly ? I shall explain these issues how and why factors may influence any kinds of business develop in their business life cycle stages.