Having forts count as supply is interesting, but ultimately would you give up your economy (and happiness!) to fix your supply? (Counting unworkable forts is not balanced, so we assume only workable ones here)
With a normal empire shape (roughly circle/square, not too spread apart), the number of frontier tiles scales linearly with diameter while supply scales linearly with area, which is quadratic with diameter. With the current supply number mechanic, wide always has the advantage on supply per frontline tiles over tall. Supply per population is supposed to address this (tall should have more population), but it seems inadequate.
Current supply numbers (assuming neutral difficulty and neutral civ):
Base supply from city: 1
Extra flat supply from buildings: +3
Extra flat supply from coastal buildings: +3
Base supply from population (only counting half of population if puppet): 25%
Extra supply percentage from buildings: +60%
Extra supply percentage from stable: +10%
Extra supply percentage from seaport: +20%
And we're not even counting wonders and policies.
It seems the supply from buildings far outweighs the base numbers, which benefits wide with its better infrastructure.
With a normal empire shape (roughly circle/square, not too spread apart), the number of frontier tiles scales linearly with diameter while supply scales linearly with area, which is quadratic with diameter. With the current supply number mechanic, wide always has the advantage on supply per frontline tiles over tall. Supply per population is supposed to address this (tall should have more population), but it seems inadequate.
Current supply numbers (assuming neutral difficulty and neutral civ):
Base supply from city: 1
Extra flat supply from buildings: +3
Extra flat supply from coastal buildings: +3
Base supply from population (only counting half of population if puppet): 25%
Extra supply percentage from buildings: +60%
Extra supply percentage from stable: +10%
Extra supply percentage from seaport: +20%
And we're not even counting wonders and policies.
It seems the supply from buildings far outweighs the base numbers, which benefits wide with its better infrastructure.