Allocation of costs in joint and by product production governs inventory costing, NRV adjustments and harvest fair value measurement. When costs of conversion are not separately identifiable, allocate joint costs between products on a rational and consistent basis, for example by relative sales value at separability or completion, or by sales value less further processing costs. For by-products deemed immaterial, compute the main product cost by subtracting the by-product's net realisable value at separation from the joint costs. Agricultural produce at harvest is measured at fair value less costs to sell and that amount is the inventory cost for this Standard.