Quote:
Originally Posted by Leathaface
What benefit does Custom House have?
The game says 100% trade route yield, but what practical benefits is that? Sometimes I get more gold when I build a customs house, other times not. I don't know if the extra gold is from the customs house or some other factor.
In the city screen you can see your trade routes and yields in the upper left, below the amount going for culture, science, gold, etc. The 100% yield doubles the base (the total may already be increased by other multipliers such as a harbor - mouse over each to see) amount for each of the trade routes. This yield is commerce. So, the increased gold, science, culture, or espionage depends on how you have your percentages (commonly called sliders) set.
I think the answer to his question is more complex.
First the 100% yield bonus only doubles foreign trade routes, so if your city only has trade routes with your own cities the custom house likely will not increase your commerce. However with the bonus from the custom house you might draw foreign trade routes to the this city after it is built.
As I understand it only one of your cities can have a trade route to a specific foreign city. The game automatically calculates which city will have the maximum trade route value for each foreign city and maximizes your trade route income for you.
So by building a custom house you might switch a foreign trade route from one of your other cities to the city with the custom house because now with the custom house bonus that city has a better trade route value.
This actually could be a bad thing. Say your capital has Oxford University and has a +6 foreign trade route but is landlocked and does not have a custom house. Then you build a custom house in one of your coastal cities and now that +6 foreign trade switches over to that coastal city because now it has a total value of +7 with that city. So yes your foreign trade route value is higher but the total value of that trade route is less to you because the coastal city doesn't have as great a science multiplier as your capital did.
It is a rare situation that a custom house is actually beneficial to you.
1) you have or expect to get foreign trade routes by building the custom house
a) the trade route value to the foreign cities is higher than trade routes between your own cities
b) the other civilizations are not running mercantilism
2) the city you build the custom house has nice science and/or wealth modifying buildings
3) you don't expect to lose the foreign trade routes anytime in the near future. This happens frequently. Another city (foreign or domestic) can draw away the trade routes you have.
I don't understand all the trade route mechanics but the value of the trade route is largely determined by
1) size of the cities
2) distance between the cities
3) whether or not they are on another landmass or not
So if your city is not as large as another city (again foreign or domestic) or if there is a city that is farther away you can lose the foreign trade route.
The custom house might help prevent foreign trade routes from being stolen by other foreign civilizations as they build custom houses and lure away your trade routes. I was wrong about this.