One common thread running through part of the history of grain trading has been the subject of federally set limits on the size of positions that a trader could hold in grain and oilseed futures and options. On 15 October, the CFTC finally approved a new rule regarding commodity position limits. Here’s a look at how we got here and what it means for agriculture. During the 1930’s Great Depression crop prices were low enough that many farms went under. Some farmers complained that rampant speculation in grain futures contracts traded on the Chicago Board of Trade (CBOT) and other exchanges were depressing crop prices. Thus, in 1936 Congress passed legislation creating the Commodity Exchange Authority (CEA) as an agency of USDA t...