The strong shift of private savings towards the stock market suggested that the 1990ps boom in consumption was financed by heavily relying on stock market performances. Looking at the U.S., between 1995 and 2000 equity prices rose by about 200% while stock market capitalization as a share of GDP went from 76 to 180. A similar growing pattern characterized the ratio of equity holdings to total financial wealth in house holds portfolios, which steadidy rose from 13% in 1985 to the peak level of 28% just before the early 2000 stock market crash. The Federal Reserve appeared then seriously concerned about the links between financial and real stability, as well as the perils that irrational exuberance might have exerted over consumer and investor confidence and thereby on real activity. In this context, a lively debate started in the economic literature aimed at defining the appropriate response of monetary policy to large swings in stock prices.
The financial accellerator model of Bernanke and Gertler (1999,2001) is probably the most prominent example of a fully fledged DSGE model with supply side linkages between the macroeconomy and the financal market. However, while it captures a quantitatively significant component of aggregate fluctuations due to credit market distortions, this framework remains completely silent on the demand side channel on which the Fed itself expressend some concern. As a matter of fact, there have been very few attempts to model the wealth effects on consumption coming from financial assets in DSGE environments. Notable exceptions are Iacoviello (2005), Iacoviello and Neri (2008) and Monacelli (2008). However, their analysis confines to the role of durables as collaterals and their implications for monetary policy, without any mention of stock market wealth.