Professor Dammann gives a summary of his article here, where he states: “The results are broadly consistent with the claim that the creation of business courts benefits firm performance. I find that the creation of business courts is associated with a 2.8 to 3.8 percentage point increase in firm performance as measured by return on assets. Moreover, the creation of a business court is associated with a 0.3 to 0.5 percentage point higher likelihood of being the target in a completed takeover with positive abnormal returns for the target’s shareholders. These results are both economically and statistically significant.”
A review of Professor Dammann’s article can be found here.