Production overflow

[theGrimm]

Does production overflow stack? In other words, what happens if a city producing 80 hammers per turn builds units worth 40 hammers per turn?

Using the same example, if the unit is built using the heroic epic, what happens to the overflow if it's then applied to a building?

[T-hawk]

Using the same example, if the unit is built using the heroic epic, what happens to the overflow if it's then applied to a building?

Production overflow is always handled in terms of base unmultiplied hammers. If you're building a 40 hammer unit with an 80 hammer city, and let's say that 80 is arrived at with a production bonus of +125% from Heroic Epic plus a forge, you will actually get 17 hammers of overflow credited (because 40 / (1 + 125%) = 17).

Then when you build another item on the next turn, that base hammer overflow will be multiplied by the appropriate multiplier. Let's say your next build is a library that gets +50% from Org Rel civic and the forge. That +50% multiplier applies to the 17 hammers of overflow plus the city's regular production for the turn.

Does production overflow stack? In other words, what happens if a city producing 80 hammers per turn builds units worth 40 hammers per turn?

It stacks, but the limit to overflow is the base hammer cost of the item that was just built. If you just built a 40 hammer unit, you can have up to 40 hammers of overflow. But if you then build a second 40 hammer unit with your 80 hammer/turn city, you will be limited to only another 40 hammers of overflow, losing the other 40.

This rule is to prevent building cheap units every turn to save up a huge hammer overflow surplus that could then complete a wonder in a single turn.