The Macedonians can choose and switch between specific Recruitment Doctrines. The doctrines are:
Balanced Recruitment: Normal production rate and normal cost of units.
Conscript Recruitment: Units cost -15% food and wood (gold cost unchanged), but have +50% training time (-33.33% training speed).
Mercenary Recruitment: Units have -50% training time (+100% training speed), but cost 10% more food and wood.
Doctrine choice is free, instant, and can be made at any Barracks, Archery Range, or Stable, and applies globally to all units trained at the same type of those buildings of the player, i.e., Recruitment Doctrine of all Barracks is separate from Recruitment Doctrine of all Archery Ranges, so they are to be set per building type.
The cost and training time of units is remembered when queued; changing doctrines in between does not change time or cost of previously queued units.