I think the description of the temple of zeus states that it gives a loyality/happines bonus of +4 without the percent. So this sounds like an attribute description in an role play game. My association was actually that it would grant a bonus according to e.g. the overall loyalty of a city. But what I found was that it grants a general bonus of 10%, I think.
Speaking of wonders, I read here quite often that the trade bonus of the colossos wears off over time. Is this true and has there been any research been conducted? I found this very hard to measure, because of the "natural" fluctuation of trade income.
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