Churning - Revisited: Trading Cost and Control

In a previous paper, Dr. McCann outlined the portfolio approach to assessing the excessiveness of trading in churning cases. In this paper, Dr. McCann and Dr. Luo demonstrate that cost-to-equity ratios of more than 4 or 5% or commission to equity ratios of 2 or 3% in accounts with turnover ratios of 2 indicate excessive trading in common stock portfolios.