[Avodah] Paying for a common wall

[Zev Sero]

On 13/09/18 16:14, Micha Berger via Avodah wrote:
> If Shimon's borders are 10x10, and Re'uvein's are 5x5, they divide by
> area. Re'uvein has 1/4 of the total area (25 sq amos out of 100), so
> I would have thought his fair share would be 25% of the price. But the
> AhS says 1/8 -- apparently splitting by area, and then again splitting
> into two shares.
> 
> That's the real problem I had.

3/4 of Shimon's fences benefit nobody but him, so he bears 100% of their 
cost.  1/4 of Shimon's fences benefit both of them equally, so they 
share that cost.

-- 
Zev Sero            A prosperous and healthy 5779 to all
zev at sero.name       Seek Jerusalem's peace; may all who love you prosper