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Planned Inventory. It refers to changes in the stock inventories that have occurred in a planned way. In a situation of planned inventory accumulation, firm will plan to raise its inventories. Unplanned Inventory. It refers to changes in the stock of inventories that have occurred in an unexpected way. In a situation of unplanned inventory accumulation, due to unexpected fall in sales, the firm will have unsold stock of goods.
Value added of a firm (GVA) = Gross value of output produced by the firm – Value of intermediate goods used by the firm.
OR
GVA = Value of sales by the firm + Value of change in inventories – Value of intermediate goods used by the firm