At least 15 days before selling any issue of obligations under section 2005
of this title, the Postal Service
shall advise the Secretary of the Treasury of the amount, proposed date of sale, maturities, terms and conditions, and expected maximum rates of interest of the proposed issue in appropriate detail and shall consult with him or his designee thereon. The Secretary may elect to purchase such obligations under such terms, including rates of interest, as he and the Postal Service
may agree, but at a rate of yield no less than the prevailing yield on outstanding marketable Treasury securities of comparable maturity, as determined by the Secretary. If the Secretary does not purchase such obligations, the Postal Service
may proceed to issue and sell them to a party or parties other than the Secretary upon notice to the Secretary and upon consultation as to the date of issuance, maximum rates of interest, and other terms and conditions.