There may be no equivalent product on which to set a market value price. There are other companies which manufacture a component which fulfils the same function as that produced by S division, so it appears that it would be possible to set a market value for this.
The key component produced by S division, however, has lower energy consumption than competitors’ products, and so in some sense may be unique. It is unclear how significant this energy saving is relative to that of the finished product, but the fact that it is in some degree unique, suggests that the price charged by S may be higher than the market price. The use of average market price of other components may be inappropriate, as this would put S at a disadvantage. This may be unfair and could reduce motivation in S division.
Market price may discourage divisions from utilising spare capacity in the selling division, for example, because the buying division can purchase more cheaply from the open market. There is said to be spare capacity in Vaa, but it is unclear in what division(s) or whether this has anything to do with the component’s transfer price.