Establishing a lean startup means founding a company or creating a product that already exists on the market. Of course, you need a good sales strategy, something new, fresh, but in this case you already know that there is demand on the market for your product and you don't have to educate your audience anymore. "The Lean Startup" is also the name of a best-selling book. Its author, American entrepreneur Eric Ries, founder and CEO of the Long-Term Stock Exchange (LTSE), describes the method in detail in the book, which has been translated into 30 languages.