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While researching on Shtut, WIKI says that the reason for that forgiveness is either הלכה למשה מסיני or human psychology.

Indeed, Rambam Mechira 12,3 writes:

"הָיְתָה הַהוֹנָיָה פָּחוֹת מִזֶּה בְּכָל שֶׁהוּא. כְּגוֹן שֶׁמָּכַר שְׁוֵה שִׁשִּׁים דִּינָר בַּחֲמִשִּׁים וּפְרוּטָה. אֵינוֹ חַיָּב לְהַחְזִיר כְּלוּם.   
שֶׁכָּל פָּחוֹת מִשְּׁתוּת דֶּרֶךְ הַכּל לִמְחל בּוֹ: "

"If the fraud has amounted somewhat less than that, — — the defrauder is not required to restore anything, since it is generally customary to forego anything less than a sixth. "

This "customary" - "דרך הכל" seems illogical to me, would you agree to forgive 17%? For example, imagine buying a siddur from a local synagogue's Gabbay for $70 and a day later stumbling upon an official pricelist that states that the price is $60. Would you feel as "surely forgive"?

THe question: was it a common practice in their times that's backed by external sources (maybe Greek or Roman law) or what's the explanation of that (nonexistent now) psychology?

While researching on Shtut, WIKI says that the reason for that forgiveness is either הלכה למשה מסיני or human psychology.

Indeed, Rambam Mechira 12,3 writes:

"הָיְתָה הַהוֹנָיָה פָּחוֹת מִזֶּה בְּכָל שֶׁהוּא. כְּגוֹן שֶׁמָּכַר שְׁוֵה שִׁשִּׁים דִּינָר בַּחֲמִשִּׁים וּפְרוּטָה. אֵינוֹ חַיָּב לְהַחְזִיר כְּלוּם.  שֶׁכָּל פָּחוֹת מִשְּׁתוּת דֶּרֶךְ הַכּל לִמְחל בּוֹ: "

"If the fraud has amounted somewhat less than that, — — the defrauder is not required to restore anything, since it is generally customary to forego anything less than a sixth. "

This "customary" - "דרך הכל" seems illogical to me, would you agree to forgive 17%? For example, imagine buying a siddur from a local synagogue's Gabbay for $70 and a day later stumbling upon an official pricelist that states that the price is $60. Would you feel as "surely forgive"?

THe question: was it a common practice in their times that's backed by external sources (maybe Greek or Roman law) or what's the explanation of that (nonexistent now) psychology?

While researching on Shtut, WIKI says that the reason for that forgiveness is either הלכה למשה מסיני or human psychology.

Indeed, Rambam Mechira 12,3 writes:

"הָיְתָה הַהוֹנָיָה פָּחוֹת מִזֶּה בְּכָל שֶׁהוּא. כְּגוֹן שֶׁמָּכַר שְׁוֵה שִׁשִּׁים דִּינָר בַּחֲמִשִּׁים וּפְרוּטָה. אֵינוֹ חַיָּב לְהַחְזִיר כְּלוּם. 
שֶׁכָּל פָּחוֹת מִשְּׁתוּת דֶּרֶךְ הַכּל לִמְחל בּוֹ: "

"If the fraud has amounted somewhat less than that, — — the defrauder is not required to restore anything, since it is generally customary to forego anything less than a sixth. "

This "customary" - "דרך הכל" seems illogical to me, would you agree to forgive 17%? For example, imagine buying a siddur from a local synagogue's Gabbay for $70 and a day later stumbling upon an official pricelist that states that the price is $60. Would you feel as "surely forgive"?

THe question: was it a common practice in their times that's backed by external sources (maybe Greek or Roman law) or what's the explanation of that (nonexistent now) psychology?

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Logic and psychology of forgoing 17% (שתות)

While researching on Shtut, WIKI says that the reason for that forgiveness is either הלכה למשה מסיני or human psychology.

Indeed, Rambam Mechira 12,3 writes:

"הָיְתָה הַהוֹנָיָה פָּחוֹת מִזֶּה בְּכָל שֶׁהוּא. כְּגוֹן שֶׁמָּכַר שְׁוֵה שִׁשִּׁים דִּינָר בַּחֲמִשִּׁים וּפְרוּטָה. אֵינוֹ חַיָּב לְהַחְזִיר כְּלוּם. שֶׁכָּל פָּחוֹת מִשְּׁתוּת דֶּרֶךְ הַכּל לִמְחל בּוֹ: "

"If the fraud has amounted somewhat less than that, — — the defrauder is not required to restore anything, since it is generally customary to forego anything less than a sixth. "

This "customary" - "דרך הכל" seems illogical to me, would you agree to forgive 17%? For example, imagine buying a siddur from a local synagogue's Gabbay for $70 and a day later stumbling upon an official pricelist that states that the price is $60. Would you feel as "surely forgive"?

THe question: was it a common practice in their times that's backed by external sources (maybe Greek or Roman law) or what's the explanation of that (nonexistent now) psychology?