This important book enhances understanding of entrepreneurial dynamics, providing the first analysis of changes in US entrepreneurial activity. Based on the unprecedented Panel Study of Entrepreneurial Dynamics, it examines adult participation in new firm creation and differences in regional firm creation activity. Shedding light on the importance of new firms for job growth, productivity enhancements, innovation, and routes for social mobility, the author tracks the success or failure of entrepreneurs, including comparisons of different groups, such as women and minorities, as well as across countries.