These have been my thoughts on Luxuries. And since I am snowed in this new years 
I will post ' em!
I have been dissatisfied with the Civ mechanism that five small civs with two cities each would require 5 luxuries. While one Civ with the same number of cities and population would only require one luxury!
Also, why wouldn't a massive Civ be unable to use 2 of the same luxuries (so large as to have no marginally diminishing effect) just as effectively as 1 different luxuries.
The following logic//equation could work.
X = population * 0.1 / Luxury
If X > 5:
Then X = 5
Else pass
= X * Luxury
Now for an example.
China has 120 population and 3 Silk.
The British have 50 people and 2 Cotton.
China has (120 * 0.1 /3)*3 = 12 from Silk
British has (50 * 0.1 / 2)*2 = 5 from Cotton
Net happiness 12 + 5 = 17
Trade 1 Luxury for 1 Luxury?
China has 120 population and 1 Cotton and 2 Silk.
British has 50 population and 1 Cotton and 1 Silk.
China has (120 * 0.1 /2) > 5 so... 5*2 = 10 from Silk
China has (120 * 0.1 /1) > 5 so... 5*1 = 5 from Cotton
British has (50 * 0.1 / 1)*1 = 5 from Silk
British has (50 * 0.1 / 1)*1 = 5 from Cotton
Net happiness 10 + 5 + 5 + 5 = 25! Clearly trade is favored
China gained 3 from trade.
British gained 5 from trade.
Maybe looking at the actual gained from trade, China may demand as well.
I found a game defines that changes the given per extra luxury. I tried changing it... it didn't do anything. poo poo
I will post ' em!I have been dissatisfied with the Civ mechanism that five small civs with two cities each would require 5 luxuries. While one Civ with the same number of cities and population would only require one luxury!
Also, why wouldn't a massive Civ be unable to use 2 of the same luxuries (so large as to have no marginally diminishing effect) just as effectively as 1 different luxuries.
The following logic//equation could work.
X = population * 0.1 / Luxury
If X > 5:
Then X = 5
Else pass
= X * LuxuryNow for an example.
China has 120 population and 3 Silk.
The British have 50 people and 2 Cotton.
China has (120 * 0.1 /3)*3 = 12
from SilkBritish has (50 * 0.1 / 2)*2 = 5
from CottonNet happiness 12 + 5 = 17
Trade 1 Luxury for 1 Luxury?
China has 120 population and 1 Cotton and 2 Silk.
British has 50 population and 1 Cotton and 1 Silk.
China has (120 * 0.1 /2) > 5 so... 5*2 = 10
from SilkChina has (120 * 0.1 /1) > 5 so... 5*1 = 5
from CottonBritish has (50 * 0.1 / 1)*1 = 5
from SilkBritish has (50 * 0.1 / 1)*1 = 5
from CottonNet happiness 10 + 5 + 5 + 5 = 25
! Clearly trade is favoredChina gained 3 from trade.
British gained 5 from trade.
Maybe looking at the actual gained from trade, China may demand as well.
I found a game defines that changes the
given per extra luxury. I tried changing it... it didn't do anything. poo poo
