What is the fine-grained topic of the following text: Again I stress that although this seller dumped a 3 million more or less position does not mean they are sophisticated,IF THEY WERE THIS TRADE COULD HAVE BEEN LEGALLY ARRANGED WITH MARKET MAKERS,WHICH LEADS ME TO BELIEVE THAT SOME CLERK SCREWED UP AND PUT SOME MARKET ORDERS IN. Only return the topic.
Potential errors in stock trading and market orders