Marker Costs

Military Units:
1A1 or 1F1: 3
1A3 or 1F3: 10
1A10 or 1F10: 30

Status Markers:
Interest: 5
Influence: 10
Protectorate: 20
Possession: 40
Dominion or State: 60

Other:
Canal: 30

Building notes:
If you upgrade a Status Marker, you pay only the difference when you upgrade (i.e. upgrading a Protectorate to a Possession costs 20 (40-20).
Military Markers may not be upgraded, downgraded, combined, or broken into parts, but can be only built or destroyed.
If you downgrade/remove/destroy any Marker, you do not get the money back for it.
Canals cannot be destroyed.