Why on TV when they're negotiating money do they write the number on a piece of paper and pass it across the table instead of just saying what it is?

it's completely stupid and it doesn't make the scene more dramatic, we've seen it overused a million times

Why on TV when theyre negotiating money do they write the number on a piece of paper and pass it across the table instead of just saying what it is?
Why on TV when they're negotiating money do they write the number on a piece of paper and pass it across the table instead of just saying what it is?
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