(a) In the case of a portfolio security that has ceased to be an Eligible Security (as defined in § 270.2a-7(a)(12)), or has defaulted (other than an immaterial default unrelated to the financial condition of the issuer):
(1) The purchase price is paid in cash; and
(2) The purchase price is equal to the greater of the amortized cost of the security or its market price (in each case, including accrued interest).
(b) In the case of any other portfolio security:
(1) The purchase price meets the requirements of paragraph (a)(1) and (2) of this section; and
(2) In the event that the purchaser thereafter sells the security for a higher price than the purchase price paid to the money market fund, the purchaser shall promptly pay to the fund the amount by which the subsequent sale price exceeds the purchase price paid to the fund.