Does the culture bonus from celebrations stack with itself?

[Melkus]

I've seen explosive rises from culture celebrations before, but didn't really bother to investigate.

But in my recent game I made screenshots after choosing the bonus a few times. Not ready for a bug report yet, but...

Well - the mysterious "Other Yield Income" goes down by 60 Culture immediately after the celebration ends, while my whole regular income is under 90 culture (at best, this is several turns later and I'm not sure what "other yield income" is besides one cultural endeavour I was running).
So that's pretty consistent with a combined 60% rise for three celebrations, is it not?

Will continue to watch this when the next celebration arrives.

This is during the celebration:





And this is how it looked like after the celebration ended ( I promise there were no other spectacular changes, not even an ending culture agreement with another leader - and no social policies that enhance culture were used)

 

[Melkus]

You're ready for the next celebration?

Here is the yield breakdown before I choose my culture bonus:

:


And now I click for the 20% Bonus - according to my theory this could go 80% higher, so we expect a 94,8 for the "Other Yield", right? (This time, I screenshotted immediately, so this is only the celebration effect, guaranteed)



Oops, even higher than that, but something is fishy here.

At least not quite as high as 1.2 ^ 4 = 2.07 times the original output (if the bonus would stack on itself with interest, which is even more unlikely, but possible), so there must be another factor I'm not seeing here...

 

[Manpanzee]

You probably have some Wine you aren't factoring in. If Wine + Celebration bonus stack multiplicatively with each other, it's possible that could also produce a larger than expected bump.

 

[Melkus]

You probably have some Wine you aren't factoring in. If Wine + Celebration bonus stack multiplicatively with each other, it's possible that could also produce a larger than expected bump.

Nailed it, thx. I indeed have no less than four wine, apparently (I got some of them by trade route - those are easy to overlook).

It still doesn't quite work out even with 1.2 * 1.1^4, which is about ~1,75 or 75% , but the difference is not quite that gamebreaking anyway.