Abstract:I am baking a cake and have run out of sugar, but I can go to my neighbor next door to get some. It was worth being nice to that neighbor even though I did not particularly fancy her. Do I have to return the sugar? Maybe she can borrow my lawn mower the next time she needs to mow her lawn and that will count as a return of the favour. Maybe the value of the sugar is trivial enough not to require repayment in kind. Now I need a recipe for a new cake. My neighbor has just the right recipe for me. But there is re… Show more
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