The author describes the main trends of the economy on the scale of a generation (80 years), and shows the strong influence of the ages of the pyramids of different countries and regions on the growth or recession of the different sectors of the economy (technology, housing construction, health, education, etc). The book shows how and long-term investment by targeting sectors and regions of the specific world, based on their demographics. An analysis far desanalyses daily and company by company. Unfortunately, this book appeared in the stock market fever early 2000s, and did not comment on the sharp fall in the medium term scholarships since 2000. However, this analysis should remain relevant in the long term.