the file you need to modify is: res/scripts/buildingutil.lua.
find inside that the 4 functions like: buildingutil.make_industrial_0_default() , buildingutil.make_industrial_1_default() ,
etc….
inside each functions there is a line: capacity = { 1, 4 },
change that 1,4 to 1,20
1,4 means a certain building will demand 1 to 4 goods. 1, 20 will make that building demand from 1 to 20 goods, depending on the development level of that building
Hope this helps…
