This is a policy proposal announcement rather than implemented action. A-score: rule_of_law(1) for potential Treasury/Fed authority questions, separation(2) for executive branch proposing major fiscal intervention traditionally requiring Congressional appropriation, capture(3) for direct government intervention in mortgage markets benefiting financial sector, corruption(1) for potential conflicts given Trump real estate background. Mechanism modifier 0.5 applied as this is proposal stage only with no implementation. Federal scope modifier 1.3. B-score: High media_friendliness(8) - concrete dollar figure, simple concept. Novelty(7) - unusual direct government MBS purchase proposal. Outrage_bait(6) - government market intervention triggers ideological responses. Layer 2: narrative_pivot(5) attempts to position Trump as housing affordability champion, timing(4) during housing affordability crisis. Intentionality indicators present (trial balloon, market signal). Final B(23.59) exceeds A(7.45) by 16.14 points, indicating this is primarily a high-hype announcement with limited immediate constitutional impact.