Two Makes A Pair;

Write about the last piece of something, and the two people who want it;

One and one makes two.

What is, the cost of a simple greeting?
What is, the cost of  a lengthy catch-up conversation?
What is, the cost of a listening ear when in need?
What is, the cost of a day of your time?

What is, the cost of your smile?

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I had you living life like you should,
You say you never had it so good.
(So Good - B.O.B)