Search Results
Working Paper
Examining the Sources of Excess Return Predictability: Stochastic Volatility or Market Inefficiency?
We use a consumption based asset pricing model to show that the predictability of excess returns on risky assets can arise from only two sources: (1) stochastic volatility of fundamental variables, or (2) departures from rational expectations that give rise to predictable investor forecast errors and market inefficiency. While controlling for stochastic volatility, we find that a variable which measures non-fundamental noise in the Treasury yield curve helps to predict 1-month-ahead excess stock returns, but only during sample periods that include the Great Recession. For these sample ...
Working Paper
Returns on illiquid assets: are they fair games?
The simplest tests of capital market efficiency are tests of the fair game model: conditional expected returns less the interest rate are equal to zero. The fair game model is thought to obtain only when markets are perfectly liquid. We show that this conjecture is false. In a model of the housing market where heterogeneous agents must search for partners in order to trade, excess returns on housing wealth are fair games if, as is appropriate, returns are defined to include shadow prices measuring illiquidity.
Journal Article
Risky mortgages and mortgage default premiums
Mortgage lenders impose a default premium on the loans they originate to compensate for the possibility that borrowers won?t make payments. The housing boom of the 2000s was characterized by increasing riskiness of the borrowers approved for mortgages and the structures of the loans themselves. Despite these changes in risk, a pricing model can justify the spreads contained in mortgages made during this period based on what at the time seemed to be reasonable expectations for house price appreciation. Contrary to those expectations, prices fell dramatically.
Working Paper
Mortgage Default and Mortgage Valuation
We develop an equilibrium valuation model that incorporates optimal default to show how mortgage yields and lender recovery rates on defaulted mortgages depend on initial loan-to-value (LTV) ratios. The analysis treats both the frictionless case and the case in which borrowers and lenders incur deadweight costs upon default. The model is calibrated using data on California mortgages. Given reasonable parameter values, the model does a surprisingly good job fitting the risk premium in the data for high LTV mortgages. Thus, from an ex ante perspective, we do not find strong evidence of ...
Discussion Paper
Determining the monetary instrument: a diagrammatic exposition
Working Paper
Risk aversion and stock price volatility
Researchers on variance bounds tests of stock price volatility recognized early that risk aversion can increase the volatility of prices implied by the present-value model. This finding suggests that specifying risk neutrality may induce a bias toward rejecting the present-value model insofar as real-world investors are risk averse. However, establishing that risk aversion may increase stock price volatility does not, by itself, have implications for the presence or absence of excess volatility. This is so because risk aversion also affects the upper-bound volatility measure computed from ...
Working Paper
Stochastic bubbles in Markov economies
Journal Article
Convex payoffs: implications for risk-taking and financial reform
Financial executive pay is a convex function of profits if recipients get a greater increment in pay when returns are high as opposed to moderate, compared with when returns are moderate as opposed to low. Convex compensation packages give financial executives incentive to adopt risky investment projects, implement highly levered capital structures, and create new risk. Financial regulators may be able to enforce changes in compensation that would attenuate these adverse effects.
Working Paper
Bubbles as payoffs at infinity
We define rational bubbles to be securities with payoffs occurring in the infinitely distant future and investigate the behavior of bubble values. We extend our analysis to a setting of uncertainty. In an infinite-horizon arbitrage-free model of asset prices, we interpret the money market account as the value of a particular bubble; a similar interpretation holds for other assets related to the state-price deflator and to payoffs on bonds maturing in the distant future. We present three applications of this characterization of bubbles.