Here’s the abstract of the study:
Critics advocate eliminating dual class shares. We find that founding families control 89% of dual class firms, potentially confounding economic inferences regarding limited voting shares. To identify the impact of dual class structures on outside shareholders, we examine stock price returns; finding that dual-class family firms earn excess returns of 350 basis points more per year than the benchmark.
Institutional owners garner a disproportionate fraction of these returns by holding over 97% of their floated shares. Overall, we show that investors demand a risk premium for holding dual-class family firms, suggesting a market-driven resolution to concerns about limited voting shares.
If the study’s right, these above-market returns may go a long way to explaining why institutions continue to throw money into these stocks.
Review the study on the Social Science Research Network's website.