CBOT soybeans jump 3.0% to 1,225.58 cents; corn rises 2.5% to 450.72 cents

The size of the move is the story here: a 3.0% intraday jump in soybeans and a 2.5% gain in corn point to a broad bid across grains rather than an isolated contract, which usually signals a shared catalyst such as weather, export demand or positioning. Because the item gives no driver, the durability of the rally is the open question. Whether the two contracts keep moving in lockstep, or one decouples, is worth watching as a read on how concentrated the underlying catalyst is.