Ken and I were both members of the RIAS seminar at Harvard, which was held in Williams James Hall, a building where approximately none of us had our offices. As

Ken and I were both members of the RIAS seminar at Harvard, which was held in Williams James Hall, a building where approximately none of us had our offices. As we waited for an elevator, two in a row went by the main floor to the basement. I mused "I wonder why everybody in the basement wants to go upstairs." His reply shot back: "You're confusing supply with demand." He was one of my heroes before I ever got to Harvard. Turned out to be a nice guy. RIP.