The thesis statement of the tipping point is that small changes can have a big impact. This is because, as the book explains, small changes can lead to a chain reaction that can have a big impact. The book uses the example of a tipping point" in epidemics, where a small number of people infected with a disease can lead to a large number of people becoming infected. The book argues that the same thing can happen with social change, where a small number of people can start a chain reaction that leads to a big change."