According to the document, entrepreneurship has expanded from for-profit businesses to include social entrepreneurship and political entrepreneurship. Entrepreneurship within large organizations is known as intrapreneurship. The term entrepreneurship is also used to describe a way of thinking that can lead to various types of entrepreneurial initiatives. The document also states that about half of working men in the United States will have some period of self-employment over one year at some point in their career, and about one in four may engage in self-employment for six years or more, according to Paul Reynolds. Entrepreneurship is also described as an important driver of economic growth in both the United States and Western Europe.