Tracking Inventory

Several options exist for inventory tracking. See Admin > Configuration > Stock for details.

Common configurations are:

Don’t track stock

Check stock level = false 
Subtract stock = false 
Allow Checkout  = true 

Track stock, but permit backorders

Check stock level = true 
Subtract stock = true 
Allow Checkout  = true 

Track stock, do not permit backorders

Check stock level = true 
Subtract stock = true 
Allow Checkout  = false