Yo! Yo! Yo-Yo!
A few months ago, I attended yet another boring Knicks game at Madison Square Garden. This time, at least something good came of it. I met a guy named Weber Hsu, one of two young Merrill Lynch employees who left finance to start a yo-yo company, Yo-Yo Nation. Weber asked if we wanted them to create a special promotional Freakonomics . . .