Obviously they didn't have gauges for measuring how much water you used, rather, you paid by pipe size. There were several different pipe sizes you could pay to have installed and you were charged according to the size of the opening.
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At what point in history? Somebody wants you to answer: Patricians and Plebeians. Originally, Patricians were those families who were Roman from the foundation of the city; plebeians were later immigrants. In time, this became a class divisionl; but the Plebeians, many of whom had grown rich, gradually took on the title of full Roman citizens and the class structure became entirely mixed. There were rich people, poor people and slaves in the late republic and Empire; but most of the rich were by now of plebeian ancestry.
In private banquets rich people invited other rich people. Public banquets were open.
They have citizenship, which places them in a privileged relationship with non-citizens.
The patricians were the Roman aristocracy. The plebeians were the commoners, both rich and poor.
Patricians :)