Quote from cdcaveman:
sounds like the same contract at different exchanges.. whats the risk?
The quantities and delivery months are the same, but these are three distinct classes of wheat.
CBOT/CME = Soft Red Winter wheat (SRW)
KCBOT/CME = Hard Red Winter wheat (HRW)
MGEX = Hard Red Spring wheat (HRS)
They have different growing regions and seasons, different logistics and export points, and different protein and baking characteristics which determine the best end use - pasta vs. cookies vs. bread flour, for example.
The spread trade between the three classes is fairly active, esp. SRW vs. HRW. SRW or HRW vs. corn is also popular.