Which of these phrases was a genuine ancient Roman marketplace tagline used by merchants to promote their businesses?

Before modern marketing departments, ancient civilizations had their own ways of promoting products and marketplaces. Their slogans and taglines were often inscribed on buildings, coins, or announced by heralds. This trivia explores the fascinating world of ancient commercial communication - can you identify which famous phrase was actually used to attract customers in antiquity?

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"Caveat Emptor" (Let the buyer beware)
"Carpe Mercatus" (Seize the marketplace)
"Qualitas Primo" (Quality first)
"Imperium Pretium" (Imperial pricing)