If your advent and colonizing with the mothership buying 2 infra upgrades is never a bad move. You also need to get a feel for how long pop takes to increase. To hit the 1st pop level with 1 infra takes maybe a minute or two for ice, desert, terran, volcanic. So getting that second one quick is a good move for your econ. Vasari can research the pop rate gain tech before even trade so a strategy for vasari can be grabbing the first two levels of that tech and focusing on infra before trade, at least getting planets up to the second infra level. As TEC though its a no brainer go straight for trade at t2 and get up your best chain as fast as possible.
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