Benefits of luxuries?

[WoundedKnight]

How much does each luxury increase happiness (& the impact of government on this?), and how much do marketplaces modify this? How many luxuries does it take to equal, say, a temple in a city? And how much do added luxuries of the same type contribute to civ happiness? Anyone know the numbers?

Thanx.

 

[BCLG100]

every luxury contributes 1 smiley face but with a marketplace
the first 2 contribute 1smiley fance each
the second 2 contribute 2 smiley faces each
the third 2 contibute 3 smiley faces each
the fourth 2 contribute 4 smiley faces each
so if you have all 8 luxuries and a marketplace you can have 20 smiley faces