Which colours dominate movie posters and why?

Well done! I was expecting less, to be honest. I liked how the article noted that colors can carry antithetical qualities, depending on the context. Since the context is cultural, it would have been interesting to extend the study to other countries.

Interesting. I was wondering if the orange/blue thing was going to extend to posters, and it looks like it does. For reference: https://priceonomics.com/why-every-movie-looks-sort-of-orang...

I thought there was a clear smoking gun reason it has become popular but it doesn't seem entirely clear cut. Except that the blue/teal makes orange (and skin) "pop" as the colors are complementary, and color swapping/enhancing has become much easier in recent years. (And I think, somewhat cynically, because both hues are both pretty far from the default green screen color...)