Strengthened Granary question

[IDB]

I have recently downloaded EB, have started a Romani campaign, and am enjoying it hugely.

The building details for a strengthened granary very informatively describe how large urban populations cannot grow enough food locally, and require food imports from farming regions (e.g. Sicily then Egypt), and list the effects of the bilding as increasing population growth, increasing happines, and increasing tradeable goods. However when I queued a strengthened granary for construction, and then examined the settlement details scroll to see the financial effect of the trade bonus, I saw that the value was flashing, indicating a decrease. This prompted me to investigate "under the covers", which revealed that the trade based income bonus defined in the EDB file was indeed negative.

I note in passing that the RTW engine seems to report this as an increase, rather than a decrease, presumably because, while negative bonuses can work, the original expectation was that all building bonuses would be positive. (IIRC I have seen a CA response to this effect somewhere.)

My question is this: Is this negative trade income bonus intentional, and if it is, could the factual description be altered to include the information that the "Increase in tradeable goods" property is misleading.

[beatoangelico]

this is intended and the description can't be modified, the engine is too stupid to display this kind of things properly
IIRC there's a malus because more supplies are kept in the province and thus not traded anymore.

[MarcusAureliusAntoninus]

Indeed, it is supposed to have a negative effect but any change to trade is displayed as an increase in game, whether it is or not.

[IDB]

Thank you for the information.

Perhaps one could also regard the loss of income as a reflection of the premium the government of a hungry city might have to pay to a supplier that has them "over a barrel"?