While doing some modding, I’ve noticed that the way income multipliers (with MULTIPLYINCOME flag) are displayed in game varies.
When listed as an effect of a policy/simulation, multipliers are displayed as grey bars filling X % of the white bar (ie. a 95% multiplier fills 95% of the bar).
When listed as an influence in the income history window of the affected policy, they are displayed as green/red bars, in a similar way to other modifiers (ie. a 95% multiplier displays as a +95% modifier), which seems to be wrong and may be misleading. See attached screenshots.
Another thing that does not seem to work as intended:
Policies and simulations which modify cost of another policy via a ‘…_cost’ effect seem to have an opposite effect to what it should be.
Example:
High immigration is supposed to rise state housing cost (at least I suppose that was the intention), with the following effect:
StateHousing_cost,0+(0.07*x)
Now, if we rise the immigration in game, for example by loosening border controls, we can observe… a decrease in state housing cost (as seen in the screenshots).
Edit: The decrease seems to be caused by the increasing minister’s experience, which suggest the effect has no impact on the actual cost, rather than being the opposite.