So, over a six year period of time, a broker manages to turnover nearly $50mm in positions in four different accounts at his employing firm and loses the vast majority of his liquid net worth in the process, $315,000. Manic day trading gone amok. Is the firm liable for some of those losses owing to failure to supervise? Put another way, does the firm's duty to supervise include a duty to protect a broker from recklessly trading himself into financial ruin?