Also, Steve Keen's Dude! Where's My Recovery?

This is bizarre, since as long as 4 decades ago, the actual situation was put very simply by the then Senior Vice President, Federal Reserve Bank of New York, Alan Holmes. Holmes explained why the then faddish Monetarist policy of controlling inflation by controlling the growth of Base Money had failed, saying that it suffered from "a naive assumption" that:

The banking system only expands loans after the [Federal Reserve] System (or market factors) have put reserves in the banking system. In the real world, banks extend credit, creating deposits in the process, and look for the reserves later. The question then becomes one of whether and how the Federal Reserve will accommodate the demand for reserves. In the very short run, the Federal Reserve has little or no choice about accommodating that demand; over time, its influence can obviously be felt. (Alan R. Holmes, 1969, p. 73; emphasis added)

The empirical fact that "loans create deposits" means that the change in the level of private debt is matched by a change in the level of money, which boosts aggregate demand. The level of private debt therefore cannot be ignored--and the fact that neoclassical economists did ignore it (and, with the likes of Greenspan running the Fed, actively promoted its growth) is why this is no "garden variety" downturn.

In all the post-WWII recessions on which Lazear's regression was based, the downturn ended when the growth of private debt turned positive again and boosted aggregate demand. This of itself is not a bad thing: as Schumpeter argued decades ago, in a well-functioning capitalist system, the main recipients of credit are entrepreneurs who have an idea, but not the money needed to put it into action:

[I]n so far as credit cannot be given out of the results of past enterprise ... it can only consist of credit means of payment created ad hoc, which can be backed neither by money in the strict sense nor by products already in existence...

It provides us with the connection between lending and credit means of payment, and leads us to what I regard as the nature of the credit phenomenon... credit is essentially the creation of purchasing power for the purpose of transferring it to the entrepreneur, but not simply the transfer of existing purchasing power." (Joseph Alois Schumpeter, 1934, pp. 106-107)