BLACK ROCK CITY, Nev. — It was dusk on the opening night of Burning Man, and the makers and misfits were touching up their art projects and orgy dens. Subwoofers oontz-oontzed as topless cyclists draped in glowing LEDs pedaled through the desert. And Paul Romer, a reigning laureate of the Nobel Prize in economics, sat on a second-story porch ...