http://finance.yahoo.com/banking-budgeting/article/111060/the-rise-and-fall-of-america
《穷爸爸，富爸爸》的作者写的这篇文章写的有些道理。 其中讲到世界上最伟大的文明国家兴盛时期大约有200年，走过以下循环过程：
The average age of the world's greatest civilizations from the beginning of history has been about 200 years. During those 200 years, these nations always progressed through the following sequence:
• From bondage to spiritual faith;
• From spiritual faith to great courage;
• From courage to liberty;
• From liberty to abundance;
• From abundance to complacency;
• From complacency to apathy;
• From apathy to dependence;
• From dependence back to bondage.
