For a deep dive on this topic, I highly recommend “Is Entrepreneurship Dead?: The Truth About Startups in America” (2018) by Scott Shane, A. Malachi Mixon III Professor of Entrepreneurial Studies, Case Western Reserve University.

Quoted from the books introduction: “It tool me longer than expected to write this book because my initial premise was wrong. American entrepreneurship isn’t in decline. But it has changed. The entrepreneurs, academics, government officials, media pundits, and economic development professionals I had spoken to were incorrect because they had looked at only a small part of the picture. Because they often sought to advocate a particular set of policies, they had drawn conclusions from small bits of data.”