If the proprietor or driver of any such hackney carriage, or if any other person on his behalf, agree beforehand with any person hiring such hackney carriage to take for any job a sum less than the fare allowed by this or the special Act, or any bye-law made thereunder, such proprietor or driver shall be liable to a penalty not exceeding F1level 1 on the standard scaleif he exact or demand for such job more than the fare so agreed upon.