The financial crisis of 2008 was the worst we've seen since the Great Depression. We've had ample time to figure out the causes of the crash, but, according to Eddy Elfenbein, who writes about investing at Crossing Wall Street, we haven’t learned the right lessons.

CNNMoney named Elfenbein "the best buy-and-hold blogger" on the Web. Last month, during an hourlong interview in Washington, D.C., I asked him how his thinking was affected by the events of 2008. Watch the following video for our exchange. (Run time: 2:49; there's also a transcript after the video.)