4. An assistant secretary is authorized to sign, for his or her sector of activity,
(1) promises and agreements for grants of subsidies or any other financial contribution of $500,000 or less;
(2) calls for tenders relating to the contracts listed in paragraphs 3 and 4;
(3) supply contracts for $100,000 or less; and
(4) services contracts for $100,000 or less.