@okie,
I will get to some >details from the Leonard article eventually.
Okie, I went back 50 pages on this thread. I was looking for the discussion we had on the "depletion allowance" in the energy field. No success. I recall explaining the concept of depreciation (allocating the cost of an asset - such as a truck - over the useful life of the item). I, or someone else, may have brought up depletion and then we got into valuing Walmart's inventory.
The concept fully complies with the big intention of accounting rules: Matching. That is, allocation the cost a long term investment against the annual revenue derived from the investment. The complication that comes into play with an energy source such as an oil well is the number of variables involved. What is the useful life - now and in the future? How much is the development cost - now and in the future? How much oil is there under the well? And on and on.
At no point, Okie, to summarize: I am confident that I never said, and I never meant to imply, that the depletion allowance is a subsidy. Someone else perhaps did, but it wasn't me.