3. Melinda Gates, 50, co-chair of the Bill and Melinda Gates Foundation; 4. Janet Yellen, 68, chair of the Federal Reserve in Washington; 5. Mary Barra, 53, CEO of General Motors; 6. Christine Lagarde, 59, managing director, International Monetary Fund; 7. Dilma Rousseff, 67, president of Brazil; 8. Sheryl Sandberg, 45, CEO of Facebook; 9. Susan Wojcicki, 46, CEO of YouTube; 10. Michelle Obama, 51, first lady, United States. Easy to obseve, women who performed in politics are better placed than women whith very good results in business or economic activities. In the whole list, Oprah Winfrey, who has a personal net wealth estimated at US $3 billion, is placed at the No 12. Elizabeth Holmes, 31, described as the world’s youngest self-made billionaire, who founded blood donor company Theranos and is now said to be worth an estimated US $4.6 billion, makes her debut being ranked No 72. Regarding their age, this year, 17 women on the list are under 45. A newcomer, the Guardian’s newly appointed editor-in-chief, Katharine Viner, was positionned at No 80.
