entails changes in real corporate actions. We document a positive relation between abnormal trading volume, future investment … expenditures, and fi nancing cash flows. This positive relation is not subsumed by the arrival of investment-related news or other …

with frictions in the adjustment of both capital and labor. We posit that hiring of labor is akin to investment in capital ….S. corporate sector data to estimate firms' optimal hiring and investment decisions and the consequences for firms' value. We then … investment and physical capital. We find that a conventional specification - quadratic adjustment costs for capital and no hiring …