Basically I am playing Terran currently and trying to understand Manufacturing Cost.  Is this a wealth thing, like each building I plop down is costing me a little bit of wealth.  Currently I see around +45 on some manufacturing buildings.  I am up to about 9 planets and control a good 1/8 of the galaxy.  I am on a huge map with like 11 other AIs at turn 150.  My influence is giving me planets slowly.  Any rate I never have any issues with wealth as I have 3000 bc, but I just was wondering how  this manufacturing cost attribute worked.  I use a lot of tourism so I am often rich and can buy things at a moments notice just in case.