The financial insecurity facing so many Americans in today’s gig economy is not the result of startups and their new apps, or even of technology in general. Temp work is the result of four decades of deliberate decisions by executives in corporate America — decisions that changed the nature of work and of capitalism itself. So explains Louis Hyman — a professor of economic history at Cornell, and Jeff Schechtman’s guest on this week’s WhoWhatWhy podcast.