Tupac and Biggie. Jay Z and Nas. Keynes and Hayek. In the wake of the 2008 recession, we partnered with Russ Roberts, a research fellow at Stanford University’s Hoover Institution, to create “Fear the Boom and Bust,” a rap battle between the two greatest economists of the 20th century. The video became a surprise viral hit, generating millions of views and spawning an equally popular sequel, “Fight of the Century.”