A growing literature (i.e. Jaffee, Lynch, Richardson, and Van Nieuwerburgh 2009, Acharya and Schnabl 2009) argues that securitization improves financial stability if the securitized assets are held by capital market participants, rather than financial intermediaries. I construct a quantitative macroeconomic model with a novel specification for mortgage-backed securities (MBS) to evaluate this claim. My findings suggest that the existence of the securitization market stabilizes the economy under the condition that financial intermediaries do not engage in the acquisition of securitized assets. In the presence of large negative housing preference shocks, the drop in output in the first year after the shock is halved, if subprime MBS are purch...