Coase and the Civil War

The following is from Alex Tabarrok at Marginalrevolution.com: Brad DeLong has an arresting post on the costs of the civil war.

* Cost of Civil War to North: $140 per capita (including only economic damages for dead and wounded)
* Cost of Civil War to South: $340 per capita (including only economic damages for dead and wounded)
* "Indirect" additional cost of Civil War to South: $450 per capita.

Cost to buy and free all the slaves? $90 per capita.