Oops,

I thought you wanted to find out the maximum theoretical limit.
I carried out some tests to find out...
I have the "No Limits" Patch:
Maxed out population, all relevant wonders/improvements, edited terrain, double production, etc. :-
Maximum one time bonus per caravan: 4848 gold
Maximum addition to trade per caravan: 2275 gold
Maximum income per turn: 55537 gold
Sorry, these figures are wrong. For the real figures see my thread on "Limits to trade".
[This message has been edited by Roman (edited April 08, 2001).]