The document summarizes key findings from a study on the on-demand economy: - An estimated 3.9 million Americans currently work in the on-demand economy, a number expected to grow to 7.7 million by 2020. - Most on-demand work is part-time, with workers averaging 11 hours per week and many having additional traditional jobs. - Workers are drawn to on-demand jobs for a variety of reasons, including earning supplemental income, testing business ideas, pursuing freelance careers, or due to difficulty finding traditional work. - In general, most on-demand workers plan to continue such work and are satisfied with it.