The Seven Sects Speech

Brad DeLong conducts a magisterial smackdown of macroeconomic errors in this multipart lecture series. (Part I, II)

Let me briefly review the right explanation for our Great Recession: the explanation that I been pushing in the past several weeks of the course, since we finished the "economic growth" section of the course. The right explanation of our Great Recession is that the downturn had three sources. First comes irrational exuberance in housing markets. Irrational exuberance in housing markets led to a substantial number of mortgage loans being made that should not have been made. These loans would not have been a problem if you had had capital market arrangements like we had in the late 1990s during the dot-com boom. The dot-com boom also saw irrational exuberance, much more irrational exuberance, in fact, than we saw in the subprime mortgage bubble.

But irrational exuberance in the dot-com boom was not accompanied by overleverage. The venture capital firms that created and issued the securities of the dot-com boom sold them off to unleveraged primary investors, rather than leveraging up and holding on to them by financing their positions with borrowed money. When the dot-com crash came, high-net-worth individuals lost their wealth. But there were no large money-center banks whose solvency was thrown into doubt by the crash.