The AnswerMug Challenge Series, Price Tags Edition: what do you think was the first item for sale in history to have a fixed/set price placed on it?

Daughters (aka brides)

Fixed price?  The pretty ones always go for more. 

Tobacco?

Possibly.  By the pound, right?

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That was sold at an auction of sorts in the old movies.  ;)

So you're saying that being an auctioned product, tobacco didn't have a set/fixed price, is that it, Thrifty?  (That's a valid observation.)

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Tea.

In the movies people bid for the farmer's crop, so no, no fixed price.  When times were hard farmers borrowed against their unharvested crops too, but that's another subject.  Oops. 

A horse, or property or a stone depending on  whatever Age it was.  Who the heck knows.