Listing 1 - 10 of 23 | << page >> |
Sort by
|
Choose an application
I characterize a dynamic economy under general distributions of households' risk tolerance, endowments, and beliefs about long-term growth. As the economy expands and the stock market rises (a) the fraction of households with declining consumption-share increases; (b) the wealth-share of high risk-tolerant households increases; (c) richer households' wealth display a higher CAPM beta; and (d) households' portfolios change qualitatively. A log-utility investor for instance borrows in contractions but lends in expansions. Variations in uncertainty and expected growth generate trading volume due to risk sharing. Higher uncertainty increases stock prices, risk premiums, volatility, wealth inequality and the dispersion of portfolio holdings, consistently with the events in the late 1990s.
Choose an application
We survey the recent literature on learning in financial markets. Our main theme is that many financial market phenomena that appear puzzling at first sight are easier to understand once we recognize that parameters in financial models are uncertain and subject to learning. We discuss phenomena related to the volatility and predictability of asset returns, stock price bubbles, portfolio choice, mutual fund flows, trading volume, and firm profitability, among others.
Choose an application
We calculate the costs and benefits of the largest ever U.S. Government intervention in the financial sector announced the 2008 Columbus-day weekend. We estimate that this intervention increased the value of banks' financial claims by $131 billion at a taxpayers' cost of $25 -$47 billions with a net benefit between $84bn and $107bn. By looking at the limited cross section we infer that this net benefit arises from a reduction in the probability of bankruptcy, which we estimate would destroy 22% of the enterprise value. The big winners of the plan were the three former investment banks and Citigroup, while the loser was JP Morgan.
Choose an application
The relation between the volatility of stocks and bonds and their price valuations is strongly time-varying, both in magnitude and direction, defying traditional asset pricing models and conventional wisdom. We construct and estimate a model in which investors' learning about regular and unusual fundamental states leads to a non-monotonic V-shaped relation between volatilities and prices. Structural forecasts from our model predict future return volatility and covariances with R2 ranging between 40% and 60% at the 1-year horizon. The model's success stems largely from backing out the endogenous and time-varying pro (counter) cyclical weights that investors assign to earnings (inflation) news.
Choose an application
We analyze how changes in government policy affect stock prices. Our general equilibrium model features uncertainty about government policy and a government that has both economic and non-economic motives. The government tends to change its policy after performance downturns in the private sector. Stock prices fall at the announcements of policy changes, on average. The price fall is expected to be large if uncertainty about government policy is large, as well as if the policy change is preceded by a short or shallow downturn. Policy changes increase volatility, risk premia, and correlations among stocks. The jump risk premium associated with policy decisions is positive, on average.
Choose an application
Investors' option-implied fear measures – implied volatility (ATMIV) and put-call implied volatility ratios (P/C) – lead key macroeconomic variables such as industrial capacity utilization and short term interest rates by up to eight quarters. We show that this interaction between fear indices, real activity, and policy variables arises in an equilibrium model where investors learn about the trend-growth regimes of economic data, and the central bank uses a learning-based Taylor rule. The model endogenously generates several time series properties of option prices including the counter (pro) cyclicality of ATMIV (P/C), the V-shape (inverse V-shape) relation between ATMIV (P/C) and monetary policy variables, the positive relation between the level and absolute changes in ATMIV, and an economically significant amount of time variation in the volatility premium.
Choose an application
We study the pricing of political uncertainty in a general equilibrium model of government policy choice. The model implies that political uncertainty commands a risk premium whose magnitude is larger in weaker economic conditions. Political uncertainty reduces the value of the implicit put protection that the government provides to the market. It also makes stocks more volatile and more correlated, especially when the economy is weak. We find empirical evidence consistent with these predictions. We also show that government policies cannot be judged by the stock market response to their announcement.
Choose an application
Our simple model features agents heterogeneous in skill and risk aversion, incomplete financial markets, and redistributive taxation. In equilibrium, agents become entrepreneurs if their skill is sufficiently high or risk aversion sufficiently low. Under heavier taxation, entrepreneurs are more skilled and less risk-averse, on average. Through these selection effects, the tax rate is positively related to aggregate productivity and negatively related to the equity risk premium. Both income inequality and stock prices initially increase but eventually decrease with the tax rate. Investment risk, stock market participation, and skill heterogeneity all contribute to inequality. Cross-country empirical evidence supports the model's predictions.
Choose an application
Many stylized facts of leverage, trading, and asset prices follow from a frictionless general equilibrium model that features agents' heterogeneity in endowments and habit preferences. Our model predicts that aggregate debt increases in good times when stock prices are high, return volatility is low, and levered agents enjoy a "consumption boom." Our model is consistent with poorer agents borrowing more and with recent evidence on intermediaries' leverage being a priced factor of asset returns. In crisis times, levered agents strongly deleverage by "fire selling" their risky assets as asset prices drop. Yet, consistently with the data, their debt-to-wealth ratios increase because their wealth decline faster due to higher discount rates.
Choose an application
We develop a model of political cycles driven by time-varying risk aversion. Heterogeneous agents make two choices: whether to work in the public or private sector and which of two political parties to vote for. The model implies that when risk aversion is high, agents are more likely to elect the party promising more fiscal redistribution. The model predicts higher average stock market returns under Democratic than Republican presidencies, explaining the well-known "presidential puzzle." Under sufficient complementarity between the public and private sectors, the model also predicts faster economic growth under Democratic presidencies, which is observed in the data.
Listing 1 - 10 of 23 | << page >> |
Sort by
|