Hammer-Food Formula

It's a fancy way of standardising yields, for food neutrality.

For example, going from one equilibrium (no growth or starvation, working your best tiles) to another one associated with a higher population (such as increasing your growth cap) and you only have featureless grassland as potentially food-positive tiles.

for a mined grassland hill, you also need 1 farm... so you have an effective yield per tile of 2:hammers: (with railroad) or 1.5:hammers: (without).
For a plains hill, you need 2 farms so you end up with 1.7/1.3.

Compare to the awesomeness of grassland workshops with all applicable civics... a full 4:hammers: that doesn't require support.

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You can expand this and also consider Slavery as an alternative. With a granary, you get a conversion of 30 / (city size + 10) or 45 / (city size + 10) with the Kremlin... for raw efficiency this often beats working hammer tiles.

However, whipping has its own issues, such as being limited by happiness - you typically need to stop using your most food-efficient tiles towards the end of the cycle. So often it gets a combined output of production and specialist-turns that you can't match with regular production but isn't the way to go all-out on hammers.
 
Every time you flip a floodplains town with levee bonus into an artist specialist, Sid Meier kills a kitten.
 
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