Got a question about yield modifiers, specifically for production. I'm playing for a science victory, and in my capital, I've got a military academy with the Integrated Space Cell policy card active (for a 15% increase to production towards space race projects). I have Ruhr Valley, for a 20% increase in production, and I also got Robert Goddard, who used his action to increase space race project production by 20%. I assumed this would mean a +55% modifier (and potentially an 85% modifier had Pingala been the governor, though I chose to stack adjacent factory production with Magnus instead), but when I checked my production numbers, it was only 20%. This leads me to believe that you can only have one modifier, and the game will automatically apply the highest value modifier when multiple modifiers exist in a city. Am I off-base on this?