Originally posted by GDR
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For a small trader it would be an inadvertent mistake. You are short wheat in one account and you want to take position off but if you log into wrong account and buy one there rather than being flat you are now long and short. They probably aren't going to haul you to jail for this but it's something you don't want to do.
Large traders would do this to manipulate markets, especially thin markets. Suppose Minneapolis wheat (thin market) is in a tight trading range and very close to top of the range and they want to establish a short position. They may try buying aggressively with relatively small volume at a slow time of day to try and trigger all the buy stops that have accumulated above the range from the people who are short. As the market moves through the top of the range all these buy stops become market orders giving volume and a good fill price to the large trader trying to get short. Although I never traded lumber it was notorious for any stop you put in was virtually guaranteed to be hit.
If you are interested in stock market/commodity market wisdom, wit and sometimes manipulation I suggest reading Reminiscences of a Stock Operator. It is a very fun and informative read.
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