This paper examines four models which might be used to account for variations in the number of producers who operate in a particular market over the lifetime of that market. Two of these are standard economics textbook models, one is a non-standard model and one is a textbook model derived from...

Recent finance literature highlights the role of technological change in increasing firm specific and aggregate stock price volatility (Campbell et al. 2001, Shiller 2000, Pastor and Veronesi 2006). Yet innovation data is not used in these analyses, leaving the direct relationship between...

Periods of Schumpetarian creative destruction are well captured by indicators of turbulence that highlight changes in inter-firm variety, such as the market share instability index and relative growth rates. Entry/exit rates do not always serve this purpose. The point is illustrated through the...

This paper explores the link between learning and corporate growth by developing different models of learning and showing that they produce observably different models of corporate growth. Using data on the growth of a number of firms in the US Automobile industry during the 20th century, we...

The paper studies the dynamics of firm growth and firm size distributions in the pharmaceutical industry from 1950 to 2003 and in the biotechnology industry from the early 1980's to 2003. Growth dynamics are studied in the context of how the size composition of firms changes, how innovation...

This paper focuses on a single simple stylized fact which stands out from the post-war history of the US Car industry, namely that industry concentration fell just at the same time as industry advertising expenditures rose sharply. Since both events were almost certainly caused by the entry and...

This paper focuses on a single simple stylized fact which stands out from the post-war history of the US Car industry, namely that industry concentration fell just at the same time as industry advertising expenditures rose sharply. Since both events were almost certainly caused by the entry and...

Recent studies find that idiosyncratic risk (IR) has increased since the 1960's and attribute this to economy wide factors such as the role of the IT revolution. To gain further insights into why IR has increased over time, our paper uses industry level data and firm level data to study if...

The paper studies the co-evolution of industrial turbulence and financial volatility in the early phase of the US automobile industry (1900-1930) and the early phase of the US PC industry (1970-2000). In both industries, stock prices were the most volatile and idiosyncratic (compared to the...