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When the historical cost principle is used, assets will remain at their historical value on the balance sheet until the time of their sale or disposal. For example, land purchased by company XYZ at a cost of twenty thousand dollars may increase in value and be worth forty thousand dollars, but it would remain on the books at the amount of twenty thousand dollars until it was sold. At the time of the sale, the increase in value is recorded as a gain on the asset.
Equipment purchased by company XYZ would remain on the balance sheet at historical cost. If at any time the equipment is sold, or disposed of, the transaction is recorded using the historical cost, less depreciation, and if there is a gain, or loss, on the disposal that would be recorded as well.