[' ', 'fal', 'justification', 'for', 'the', 'restriction', 'was', 'substantial.', 'Thus,', 'for', 'example,', 'in', 'Linmark—where', 'a', 'township', 'had', 'for-', 'bidden', 'the', 'posting', 'of', '“For', 'Sale”', 'and', '“Sold”', 'signs', 'in', 'residential', 'neighborhoods', 'to', 'stem', 'white', 'flight—the', 'Court', 'invalidated', 'the', 'restriction', 'even', 'though', 'it', 'ac-', 'knowledged', 'that', 'the', 'restriction', 'served', '“the', 'vital', 'goal”', 'of', 'promoting', 'stable,', 'racially', 'integrated', 'housing.’®', 'In', 'Central', 'Hudson—where', 'the', 'state', 'had', 'banned', 'promo-', 'tional', 'advertising', 'by', 'electric', 'utilities—the', 'Court', 'in-', 'validated', 'the', 'ban', 'even', 'though', 'it', 'agreed', 'that', 'energy', 'conservation', 'is', 'an', '“imperative', 'national', 'goal.”', '**', 'In-', 'deed,', 'in', 'most', 'of', 'the', 'Supreme', 'Court’s', 'commercial', 'speech', 'cases', 'since', '1976,', 'the', 'government', 'has', 'advanced', 'justifications', 'that', 'the', 'Court', 'accepted', 'as', '“substan-', 'tial.”', 'But', 'in', 'none', 'of', 'those', 'cases', 'did', 'the', 'Court', 'permit', 'the', 'justifications', 'to', 'serve', 'as', 'a', 'basis', 'for', 'content-based', 'restrictions', 'on', 'truthful', 'commercial', 'speech', 'prior', 'to', 'Posadas.', 'In', 'short,', 'restrictions', 'on', 'truthful', 'speech', 'proposing', 'lawful', 'commercial', 'transactions', 'inevitably', 'conflict', 'with', 'fundamental', 'values', 'protected', 'by', 'the', 'First', 'Amendment.', 'Although', 'the', 'majority', 'opinion', 'in', 'Po-', 'sadas', 'indicates', 'that', 'not', 'every', 'restriction', 'on', 'speech', 'interfering', 'with', 'First', 'Amendment', 'values', 'automati-', 'cally', 'will', 'be', 'invalidated', 'on', 'that', 'basis,', 'nothing', 'in', 'Posadas', 'reasonably', 'can', 'be', 'interpreted', 'as', 'signaling', 'the', 'Court’s', 'rejection', 'of', 'those', 'values—or', 'as', 'permit-', 'ting', 'a', 'legislature', 'or', 'reviewing', 'court', 'to', 'ignore', 'them', '18', 'Tinmark,', '481', 'U.S.', 'at', '94.', 'The', 'Court', 'stressed', 'that', 'the', '“basic”', 'constitutional', 'defect', 'in', 'the', 'ordinance', 'was', 'its', 'attempt', 'to', 'manipulate', 'the', 'behavior', 'of', 'the', 'township’s', 'residents', 'by', 'preventing', 'them', 'from', 'obtaining', 'information.', 'Id.', 'at', '96-97.', '19', 'Central', 'Hudson,', '447', 'U.S.', 'at', '571.', 'FLAT', 'S895', 'ge']