Fascinated by this and by the replies. Very weird to me. Doesn’t USAnia have ‘weights and measures’ regulation? In UK it is not legal to sell beer (or spirits) in anything other than legally mandated units. Glasses have regulation filling marks on them, too. That way, consumers know what they are getting and can also be aware of the price of different tipples on a common comparison basis. A pub landlord found selling short measures, however advertised or priced, would soon be in trouble, both commercial and legal.
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