There is a lot in the media about TTIP at the moment. The aim is to increase trade and thus increase wealth. I cannot find how the evidence has been generated apart from speculation, often contradictory, e.g.
http://trade.ec.europa.eu/doclib/docs/2013/march/tradoc_150737.pdf
http://ec.europa.eu/trade/policy/in-focus/ttip/
http://ase.tufts.edu/gdae/Pubs/wp/14-03CapaldoTTIP.pdf

Update 2015-01-16