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It is not necessary that the custom be based on the sages, nor even based on Jews, for even if gentiles established the custom – as, for instance, where they are in the majority in that location – it is still Torah law that the standard should follow the custom, for absent another provision it is as if they conditioned [the contract] on the prevailing custom… therefore it does not matter who it is who has established the custom. [translation by Hekhsher Tzedek "Al Pi Din" by Rabbi Avram Israel Reisner for Heksher Tzedek Commission of RA/USCJ]

1. What types of customs is Rav Moshe referring to?
2. In what ways do we follow Rav Moshe in our business practices today? In what ways do we fail to do so?