I like emphasizing the happiness bonus over the production bonus on Aristocracy for a few reasons:
- The happiness boost is tall-empire friendly, while the production boost is wide-friendly.
- The happiness bonus is more useful than the production bonus on high difficulty levels.
- I like giving bonuses that help National Wonders a lot.
1) Fixed per-player happiness is more useful for tall empires than wide. The reason for the happiness advantage is clear: as we get more cities, the proportional effect of a fixed income reduces.
In contrast, a production bonus is more useful for wide empires. This is somewhat less obvious, but consider one basic thing about wide empires... they're usually expanding. Each new city adds to the cost of national wonders, so production bonuses to get the NW built quicker (before the cost can go up further) are a big help. In contrast... a production bonus for a tall empire will only shave a turn or two off the build time regardless of circumstances.
2) At higher difficulty levels it becomes very hard to get world wonders. The AIs are usually ahead of us technologically, and have massive production bonuses that let them build things faster. In addition, losing a manually-built wonder race can significantly change the outcome int he game.
The place where the human has an advantage over the AI is
planning. A human can strategize their early game to get a great engineer, saving it up for one specific wonder. This is why many players only build wonders with Great Engineers. As a result, the production bonus is not particularly useful on hard difficulty levels.
3) The advantage of national wonders is they're assured... we can't lose a race to get one. This is mainly useful on high difficulty levels. With just these national wonders:
- National College
- National Epic
- National Treasury
- Circus Maximus
- +1 world wonder
We've already got 10

, same as the Notre Dame world wonder that's been getting a lot of attention lately. That's a decent amount of happiness from a policy like this.
1

per 2

in each city (or tweak those numbers to whatever is balanced).
This is not possible without the c++ only Firaxis has access to, but I'm always open to other ideas if you can think of anything.
I suspect this will have overcompensated and made [Meritocracy] too strong. +25% trade route yield is very powerful.
These are the net changes to the Liberty tree:
- Free great person removed
- Happiness bonus moved up a tier from Meritocracy to Finisher
- +0.5
per city and 25%
trade route bonus
The first two are somewhat significant nerfs, so I do want to balance that out and keep the overall tree useful.