Economic and Research Treaties. What do they do?

The treaty gives the recipient 10% of either your research or economic output (although I admit I'm not sure whether that economic output is only tax output or total output). Note this does NOT diminish how much research/economy you get, you simply pass them some data or let them share in your prosperity.

Obviously, it's always better to be on the receiving end of one of these treaties. If you put the effort in, you can usually buy AI research treaties for a few thousand bc. Economy treaties are much harder to get.

I belive there is also a diplomatic bonus given for the civilization you have the treaty with. And It really helps discourage that civ from declaring war because it hurts your relations with all other civs when you break a treaty by declaring war.

FYI: You can right-click on stuff in the trade screen to get more information about what they do - including the treaties

Isn't that in TA only?