Schedule of the United States to Annex 2–B of the USMCA is a specific or compound rate of duty, the President shall substitute for the base rate an ad valorem rate that the President determines to be equivalent to the base rate. (4) Tariff-rate quotas In implementing the tariff-rate quotas set forth in the Schedule of the United States to Annex 2–B of the USMCA, the President shall take such actions as may be necessary to ensure that imports of agricultural goods do not disrupt the orderly marketing of agricultural goods in the United States. (5) Presidential proclamation authority relating to rules of origin (A) In general The President may proclaim, as part of the HTS— (i) the provisions set forth in Annex 4–B of the USMCA