Strategy Is Not Operational Efficiency: You can run the best kebab shop in London, UK but if you are doing something that many people can copy, you are not going to make any money. You need a great strategy, but the first step is picking the right industry. Anyone can become a proofreader. The most profitable sectors in the US earning over 20% growth per year: pharmaceuticals, high-technology, financial services, discount department stores, and oil. The worst industry is airlines. Picking the right industry, one with a sound structure, where your chances of making a profit are highest, was where good strategy begins. Note that you should be interested in what you are doing with your time. Passion is also important.