why just refine oil is mush efficent than make microchip?
refine oil chain just need three machine (import 1, refine 1, exporter 1)
but micorchip need 10 (importer 4, refine 2, furnace 2, assemble 1, export 1 )
and value is just double.
add space effeicent, two oil refine line is mush effcint than microchip.