I've received a number of requests for assistance with product costing model (e.g., Activity Based Costing) lately.
My Dad (in commercial lending) told me to be wary of the
FISH method, usually used by companies in trouble . . .
First
In,
Still
Here. True story . . . he had one client - a charcoal manufacturer . . . they had a warehouse fire . . . charcoal didn't light. True story.
Anyway, more people than I would have predicted aren't familiar with the throughput model of costing.
Everyone knows that for GAAP purposes, the cost of manufactured inventory is equal to material, plus labor, plus overhead. (But remember, GAAP isn't written to help managers run businesses.) Most folks are familiar with the accounting game that allows you to lower your cost per unit by making more finished goods inventory, called "full" (or fool) costing.
The throughput method says that you can only inventory material and you treat all conversion costs (labor and overhead) as expenses in the period incurred. Thus, with throughput, you make money by efficiently manufacturing
and selling stuff. You cannot manipulate the cost per unit by making more vs. less.
I had one manufacturing client (make-to-order) who had about 150 days of finished goods inventory on the shelf because they would make more in order to lower the set-up cost per unit.
Homework: Read "The Goal" by Eli Goldratt
- Dr. M