From: Philip Dunn (pscumnud@DIRCON.CO.UK)
Date: Sat Sep 24 2005 - 14:43:23 EDT
Can unit values be negative? When they are positive, why are they positive? The unit values of sold commodities must be positive because they are sold for an equivalent sum of money whose value is positive. This applies to flows. Stocks of commodities that are not currently being sold but will be sold eventually will also have positive unit values. But stocks that will never be sold could have negative or zero unit values. Indeed, they must have. Consider a simple model with traditional agriculture. At the beginning of the final period there is a positive physical stock of corn. At the end the physical stock is zero, as is its value, and no corn has been sold. However, labour has been performed and value added is positive and must be equal and opposite to the value of the opening stock of corn to give zero sales and closing stock. Phil
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