Why MC ? I know what it does, but I missed why one should limit society.
After level 84 (I think, somewhere around there) you no longer produce surplus food, which means you have to pay for it to be brought in by Bulkfreighter, or when you get to 0 stored your planet starts to buy it. Also, after level 70ish, you lose 300 people a day which means less steel. The only positive is that your rare resource production (and consumer goods, I think) shoots up, but after a while you just can't spend it all.
