Slitherine

In the build dialogue the benefits are displayed with all the current multipliers counted in. Makes sense because you know what you get.
Unless you have some rather temporary modifiers like 'just conquered' -100% commerce. Then the money yield for e.g. a market will be '0' or even IIRC the line will be completely ommitted.
For some buildings it may look like they have no benefit at all. That looks weird until you understand why but you still haven't got a clue how worthwhile this building is.

I guess this was a deliberate decision because to do so makes sense most of the time. But I would suggest to always add the information what the normal benefit without modifiers would be and/or show the calculation of how the number came into being (mouse over?).
That would help to make a better decision in some cases and cause less confusion.

This was also decided against, in our continual fight to not clutter the interface with too many numbers and words. You would be surprised how easy it is to frighten players with 'too much information'.

I know this can be misleading at time, but that's the smallest price to pay compared to others alternative.