Eddy Elfenbein, who writes about investing at Crossing Wall Street, was named by CNNMoney as “the best buy-and-hold blogger” on the Web. Yet even buy-and-holders (myself included) have to be disciplined sellers of stocks.

Last month, during an hourlong interview in Washington, D.C., I asked Elfenbein how he approaches the selling process. Watch the video below for his insightful answer. (Run time: 1:52; there’s also a transcript below.)