Bava Metzia 24 - Shabbat March 23, 13 Adar 2

Shmuel listed three areas in which we can assume Torah scholars may be dishonest. Why? Can we assume they are honest in all other areas? Rabbi Shimon ben Elazar says that if something is lost in a public place, we can assume the owner despaired (has given up hope of ever getting the item back) and the finder can take the item. The Gemara questions whether he meant this only in a place where the majority of the people are Gentiles or even in a place where the majority are Jews. If he included also a place where the majority are Jews, do the rabbis agree, or do they disagree with him about both, or only in a case where the majority are Jews?  Do we hold like Rabbi Shimon ben Elazar and if so, in both cases or only in the case where the majority are Gentiles? The Gemara tries to answer these questions by bringing various tannaitic sources and cases from the amoraim but most attempts to answer the questions are inconclusive.