In order to make payment to the Commodity Credit Corporation for any commodities transferred to the national stockpile pursuant to section 1743(a)(4) of this title, there are authorized to be appropriated amounts equal to the value of any commodities so transferred. The value of any commodity so transferred, for the purpose of this section, shall be the lower of the domestic market price or the Commodity Credit Corporation's investment therein as of the date of transfer to the stockpile, as determined by the Secretary of Agriculture