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Wasn't that originally to sell newspaper?
It was originally to force the cashier to open the till.
Say an item was $20. If the customer paid with a $20 note, then the cashier could, intheory, pocket it, without it showing up on the rocords. If it was $19.99 they needed to open the till to get a cent out. This meant it was recorded, and so the till wouldn't balance.
correct answer (as far as my opinion is concerned without doing any actual research)
To be fair, my research is decades old at this point.
I thought it was a trick by sign writers who charge by the letter.
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