[Avodah] How much for the mayo?

[T613K at aol.com]

Here's a question of the type that I think Avodah-ites  (Ovdim?) sometimes 
like to discuss.  
 
I bought a large jar of mayonnaise, and the lady at the checkout  pointed 
out that it was on special that week,  "buy one, get one  free," so I might 
as well get a second jar -- which I did, even though I didn't  need so much 
mayo and now have extra mayo sitting on a shelf, not to be used  probably for 
many weeks.
 
The mayo cost, let's say, four dollars, something like that.
 
A few days later my neighbor asked me if I could spare a couple of spoons  
of mayo for her kids' lunch, as she was out of mayo.  I told her I could do  
better, I had a whole extra unopened jar of mayonnaise  on the shelf, which 
 I happily gave her.  She asked me how much she owed me for it, and this  
left me with a question.
 
1.  The replacement cost of the mayo, weeks from now when I need some  
more, will be $4 -- so I should charge her $4?
 
2.  The actual cost of the mayo to me was zero -- since I only got  that 
second jar because it was "get one free."  So I should charge her  nothing? If 
I charge her anything, I am stealing from her?
 
3.  In reality, no matter how the store advertises it, what I got was  two 
jars of mayo for four dollars.  So I should charge her two dollars for  one 
jar?
 
I will tell you what I did after you tell me what I should have done.   
Thank you.
 
--Toby Katz
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