We incorporate long-term defaultable corporate bonds and credit risk in a dynamic stochastic general equilibrium business cycle model. Credit risk amplifies aggregate technology shocks. The debt-capital ratio is a new state variable and its endogenous movements provide a propagation mechanism....

The economics workings of the corporate income tax remain controversial. Harberger's seminal 1962 article viewed the tax as raising the cost of capital used to produce corporate goods. But corporate goods can be and generally are made by non-corporate firms, suggesting that the corporate tax...

Many economic decisions can be described as an option exercise or optimal stopping problem under uncertainty. Motivated by experimental evidence such as the Ellsberg Paradox, we follow Knight (1921) and distinguish risk from uncertainty. To afford this distinction, we adopt the multiple-priors...

This paper provides a model in which firms face idiosyncratic productivity shocks and endogenous credit constraints. We show that stock price bubbles can exist and allow capital to be reallocated to more productive firms. The collapse of bubbles tightens credit constraints and reduce total...

Stock price bubbles are often on productive assets and occur in a sector of the economy. In addition, their occurrence is often accompanied by credit booms. Incorporating these features, we provide a two-sector endogenous growth model with credit-driven stock price bubbles. Bubbles have a credit...

This paper develops a macroeconomic model with a banking sector in which banks face endogenous borrowing constraints. There is no uncertainty about economic fundamentals. Banking bubbles can emerge through a positive feedback loop mechanism. Changes in household confidence can cause the collapse...

This paper introduces endogenous credit constraints in a search model of unemployment. These constraints generate multiple equilibria supported by self-fulfilling beliefs. A stock market bubble exists through a positive feedback loop mechanism. The collapse of the bubble tightens the credit...

This paper offers an ambiguity-based interpretation of variance premium --- the difference between risk-neutral and objective expectations of market return variance --- as a compounding effect of both belief distortion and variance differential regarding the uncertain economic regimes. Our...

We present an analytically tractable general equilibrium business cycle model that features micro-level investment lumpiness. We prove an exact irrelevance proposition which provides sufficient conditions on preferences, technology, and the fixed cost distribution such that any positive upper...

To study the long-run effect of dividend taxation on aggregate capital accumulation, we build a dynamic general equilibrium model in which there is a continuum of firms subject to idiosyncratic productivity shocks. We find that a dividend tax cut raises aggregate productivity by reducing the...