This dissertation consists of three independent essays. Chapter 1, "The Effect of Mortgage Securitization on Foreclosure and Modification," assesses the impact of mortgage securitization on foreclosure and modification. My primary innovation is using the freeze of private mortgage securitization in the third quarter of 2007 to instrument for the probability that a loan is securitized. I find that privately securitized mortgages are substantially more likely to be foreclosed and less likely to be modified. Chapter 2, "Disagreement and Liquidity," analyzes how disagreement between investors affects the relationship between trading, liquidity, and asymmetric information. Traditional models predict that asymmetric information should destroy tra...