I checked out the price of AMs (B2s) a couple of months ago and $209k was the price last traded. Sometime last week, $386k traded. Now I know that the cbot & cme merger was announced in the meantime, but why have the AMs rallied so strongly? & why over the same time period has the full membership declined from $1m to $850k? Any insight into these price moves and predictions for the future would be appreciated. Not being located in Chicago, or even the USA, I think I may be missing the bigger picture. (I'm thinking of buying an AM myself)