We find that new firms real investment responds much more elastically to aggregate Tobin s Q than does that of established firms. On the financial side, IPOs respond more elastically to Tobin s Q than seasoned offerings of securities. The explanation seems to be that a high aggregate Q raises...

A general purpose technology or GPT is a term coined to describe a new method of producing and inventing that is important enough to have a protracted aggregate impact. Electricity and information technology (IT) probably are the two most important GPTs so far. We analyze how the U.S. economy...