It has been a few years since markets were whipsawed by a series of inexplicable quarterly stocks surprises from USDA. Even if those numbers to be released on 29 September do deviate some from expectations, potential market reaction will be muted.It was not so many years ago that traders of both grain and soy futures viewed each of USDA’s quarterly stocks estimates with considerable trepidation. This was because those numbers had somewhat of a history, based on reasonably well-known use factors, of not tracking well with the previous such estimates. This was especially true for corn. Thanks to regular weekly data, private analysts could fairly calculate the volumes of corn exported and consumed by ethanol production during a particular thre...