The log-periodic power law (LPPL) is a model of asset prices during endogenous bubbles. A major open issue is to verify the presence of LPPL in price sequences and to estimate the LPPL parameters. Estimation is complicated by the fact that daily LPPL returns are typically orders of magnitude...

The log-periodic power law (LPPL) is a model of asset prices during endogenous bubbles. If the on-going development of a bubble is suspected, asset prices can be fit numerically to the LPPL law. The best solutions can then indicate whether a bubble is in progress and, if so, the bubble critical...

We investigate the market and firm-specific factors that may impact firms’ product choices in the U.S. biotech corn seed market. Specifically, we estimate how the competition effects, the conglomeration effect, the similarity effect, and other market shifters influence firms’ variety choices...

Graphene, a rapidly rising star on the horizon of material science, has a unique two-dimensional nanostructure as well as exceptional mechanical, optical and electronic properties. Despite its short history, graphene has exhibited great potential applications in counter electrodes, acceptor and...

This paper examines Chinese pesticide firms’ use and perceptions of various means of intellectual property (IP) protection in protecting their innovations, using a unique dataset from 97 pesticide firms surveyed in 2008. These firms rate Chinese patents as quite effective in protecting...