Reference for Bava Batra 329:3

רשב"ג אומר הכל כמנהג המדינה: ותנא קמא לית ליה מנהג מדינה

[were meant]. RABBAN SIMEON B. GAMALIEL SAID: ALL DEPENDS ON THE USAGE OF THE COUNTRY. And does not the first Tanna hold [the principle of the] 'usage of the country'?<span class="x" onmousemove="('comment',' Surely he does. Wherein then, does R. Simeon b. Gamaliel differ from him? ');">³</span>

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