Recent empirical work using panel data documents that, while the correlation of investment and Tobin's Q is low, the correlation of investment and credit spreads is high. We propose an explanation for these empirical findings, based on time-varying risk, i.e. stochastic volatility. In our model,...

The paper builds up a macro function of investment to capture various key determinants and explore the intricate determination mechanism of aggregate investment. It explicates the basic trend determinant of investment, locates the cause of investment volatility and identifies the magnifier of...

We study the time-varying effects of Tobin's q and cash flow on investment dynamics in the USA using a vector autoregression model with drifting parameters and stochastic volatilities estimated via Bayesian methods. We find significant variation over time of the response of investment to shocks...