Now Let's come to ToA, for 275 hammers, we get 5 GPP + 1H + 1G + 3B + double trade route income each turn. When currency and burea bonus kick in, we could gain at least 6C from the trade route income and this bonus getting more when the size of Delhi and AI's capital growing bigger. I don't even need to mention the earlier gain before CS, the gain after CS from ToA is 5GPP + 1.5H + 1G + 5.25B + 6C each turn, How many turns do we need to make it profitable for the hammers we invest?
I worldbuildered in ToA to check... the 100% to trade routes isn't added, but it's a multiplier of the base 1.00
trade route.
Meaning we gain 1 commerce from each trade route.
The actual yield from ToA is then 10GPP (Philo)+1.5H(bureau)+1G+5.25B+2C.
Of course trade routes value will increase over time but it isn't that strong as it obsoletes at SM of course.
Back to HG: since we'll most likely build most of it under Bureaucracy but Aqueduct pre-CS, total cost is
450/2.5+150 = 180+150 = 330H
We've already put 50H in ToA so 475 are left. The difference however is it will be complete
before Bureaucracy so the cost really is
475/2 = 237.5
So the actual hammer difference is more like 100H in build cost.
3 pop is already better across the empire but then you have to factor in the extra yield from ToA in Delhi. It starts getting complicated however as we also need to consider the pop points that we won't whip in the cities.
Finally there's the odds we lose out on it which are actually high (especially if we don't whip!)
In a perfect world, I'd take both of them. I think we need to carefully make this decision.
How soon are we going to obsolete ToA? Do we want something post-SM from Liberalism? (say Biology/Electricity/Radio?)