> Sure. But your local Tesco is going to buy (and transport) 12,000 tins of 
> beans (or whatever) no matter what, so how many of them *you* buy is 
> irrelevant. And yet, if you buy 10 of them, they give you 10% off the 
> price. (Or, more accurately, if you buy less than 10 they charge you 
> extra.)

Err no, if Tesco are planning to announce a "buy 10 get 10% off" offer, they 
will certainly order a lot more beans accordingly.  Even though you may 
think what you are doing is unique, over the entire shopping population 
there exists a very predictable average of how people will react to such 
offers.  If Tescos couldn't predict that they'd be out of business - and out 
of beans :-)

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