Plato, Laws 920b

τοὺς δὲ μὴ τοιούτους ἐπιτηδεύματά τε ἐπιτηδεύοντας ἃ ῥοπὴν ἔχει τινὰ ἰσχυρὰν πρὸς τὸ προτρέπειν κακοὺς γίγνεσθαι, φυλακτέον μᾶλλον. ταύτῃ δὴ τὰ περὶ τὴν καπηλείαν πολλὴν οὖσαν καὶ πολλὰ ἐπιτηδεύματα τοιαῦτα κεκτημένην, ὅσαπερ ἂν αὐτῶν λειφθῇ δόξαντα ἐκ πολλῆς ἀνάγκης ἐν τῇ πόλει δεῖν εἶναι, συνελθεῖν αὖ χρεὼν περὶ ταῦτα τοὺς νομοφύλακας μετὰ τῶν ἐμπείρων ἑκάστης καπηλείας,

and who follow pursuits which greatly to urge them on the road to vice; and these must regard the more. Accordingly, with respect to retail trading, which is a multifarious occupation, embracing many callings of a similar nature,—with respect (I mean) to so many branches as are allowed to exist, as being deemed absolutely necessary to the State, concerning these the procedure shall be the same as that previously described