Thunderbrd
C2C War Dog
Just to clarify, he said + 40 so I'd say he means he has 40 OVER whatever unhappiness. You're example of 40 happy and 30 unhappy would be thus expressed as +10 happy.
I've been having pretty much the same experience. I've never had an unhappy city all game as I go into the Classical era here.
Not that I mind too terribly. If you let crime get out of control it can still happen of course. War... that can do it as well so not having experienced a war yet I don't know how much of an impact that may have.
Since we've pretty much lost the ability to exchange research and gold into happiness via cultural spending on the slider there isn't much we can do about it if we start going unhappy so it's not bothering me that there's a bit more margin.
I've been having pretty much the same experience. I've never had an unhappy city all game as I go into the Classical era here.
Not that I mind too terribly. If you let crime get out of control it can still happen of course. War... that can do it as well so not having experienced a war yet I don't know how much of an impact that may have.
Since we've pretty much lost the ability to exchange research and gold into happiness via cultural spending on the slider there isn't much we can do about it if we start going unhappy so it's not bothering me that there's a bit more margin.

manifesting itself as as issue is almost nil. But I also think this is appropriate for the eras we're talking about. I'd imagine at 45000 BC people weren't unhappy about the situations in which they lived. I imagine they were glad to have shelter from the elements and protection from predators. 
, and the liberal civics should (in general) have bonuses to
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, and better bonuses overall. This would reflect the freedom of thought and speech in more liberal societies that leads to advances in research, art, and trade. If you are playing with REV on, oppressive civics should increase REV more than liberal ones. If you have the ability to petition your government for change you aren't as like to start stockpiling weapons and planning a coup.
/etc. If there are more consumers than 
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