Does the tariff function work?

[Taqwus]

The resource penalty that occurs when you're a protectorate or subjugate empire is computed based on your gross resource production. -20% or -40% could make it difficult to develop an infrastructure and still amass a fleet... and it'll certainly set you far back behind somebody who's got a trade alliance with the Big Kahuna for a +20% of BK production.

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-- The thing that goes bump in the night