Here's what my client told me: Obviously printing costs should go to the physical book alone, but other production costs - like outside proofreading, typesetting, and editing, or any artwork/photography - should apply to both versions.In some cases, there are specific costs which apply only to a digital version - like format conversion costs, or, in the case of textbooks, outside design and programming.
Since there is no inventory and no scaling production cost based on qty sold, how best to apply COGS?
XXXX wants to create a virtual warehouse and keep inventory based on projected lifetime sales. Projected sales divided by costs = cogs per unit.
I hate this idea. Adding a virtual warehouse and tracking virtual inventory seems like such a waste of effort. I think the same thing can be done by simply doing the same math, enter the cogs as a unit cost and then track lifetime sales on a monthly basis. If anything surpasses its projected lifetime sales, at that point the unit cost can be set to 0.