There are two sides to the sale of an asset: a one-off payment to the seller and an expected stream of profits to the buyer. If the price is efficient, these two sides of the transaction should be equivalent: that is, the purchase price represents the net present value of the future stream of profits (i.e. the commercial value).
In general, in respect of sales of government assets the value of the business to the purchaser should exceed the commercial value of the asset if retained in Crown ownership because of the greater efficiencies likely to be achieved in private ownership. A competitive sale process should ensure that the value of those expected efficiency gains are captured by the Crown in the sale price. (see R. Kerr blog and www.treasury.govt.nz)