The bottom line is
Timber stocks, method I 7
Footnote 7 says it's after a positive return to capital, which means the revenue above this basic valuation is economic rent. It doesn't say this for oil..., they must use a different method for subsurface resources.
Knew I should have studied statistics at uni instead of music. Yet another bad life choice. Frank
Footnote 7
The values presented in method I are based on a present value calculation that assumes a positive return to capital (present value I).