Commerce SMAC Sid Meier's Alpha Centauri


Commerce SMAC



Commerce increases the value of treaties, pacts and loans between SMAC Factions in Firaxis' TBS Game of 1999, Sid Meier's Alpha Centauri (SMAC).

Commerce is computed base by base between factions with Treaties and Pacts, as follows:

  • First, all bases for each faction are ranked from top to bottom by Energy output.
  • Bases are paired off from top to bottom. If one faction has extra bases, these are ignored.
  • For each pair of bases, sum the combined economic output and divide by 8, rounding up.
  • Double this value if a Global Trade Pact is in effect.
  • Now, for each individual base, the commerce formula is as follows: (ValueFromStep4) * (CommerceTech+1) / (TotalCommerceTech+1)
  • CommerceTech is the total # of economic technologies discovered, plus
  • faction & social bonuses.
  • TotalCommerceTech is the total # of economic technologies in the game.
  • Now, using the value from step 5, divide by 2 if no Pact (e.g. only a Treaty)
  • Add +1 if you are Planetary Governor.
  • Reduce to zero if sanctions are in effect against either faction.

Commerce is bonus energy generated from trade between two friendly factions. Whenever you sign a Treaty or Pact with another faction, your bases will automatically begin to accrue commerce (and this benefit extends to your partner faction as well).

Commerce is interrupted whenever a Vendetta occurs between two factions, or when sanctions are applied against a faction which has committed an atrocity. Think of Commerce as a reward for peaceful behavior.

Between two factions, commerce is more beneficial to the faction which has discovered the most Economic technologies. Morgan Industries gains additional bonuses here. Commerce also tends to benefit the current Planetary Governor.

Increase Commerce


  • Sign more Treaties.
  • Sign more Pacts (Pacts receive double commerce).
  • Increase the size and economy of your bases ("it takes energy to make energy").
  • Discover more economic-related technologies

Economic-related Technologies



SMAC Guide Units SMAC Modules SMAC
Factions SMAC Chassis SMAC Reactors SMAC
Base Facilities SMAC Weapons SMAC Unit Special Abilities SMAC
Technology Tree SMAC Armor SMAC Secret Projects SMAC

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