Where are the two speakers?

W: I enjoy going through secondhand book-stores. I could see what people used to enjoy reading. Did you see this old book of children’s stories?
M: Some of these books aren’t so old, though. See? This mystery was published only six years ago. It cost seventy-five cents. You can’t beat that!
W: Hey! Look at this!
M: What? Are you getting interested in nineteenth-century poetry all of a sudden?
W: No. Look at the inscription! Someone gave this book as a present, and wrote a note on the inside of the front cover. It’s dated 1893. Maybe it’s worth something.
M: Everything on that shelf is worth fifty cents.
W: But if this is a signature of someone who is well known, it might bring a lot more. I hear William Shakespeare’s signature is worth about a million dollars.
M: Oh, I can hardly read what that one says. Who wrote it?
W: The name looks like Harold Dobson. Maybe Dobbins? Wasn’t he a politician or something? I am going to buy this book and see if I can find a name like that in the library.
M: Good luck! Your poetry book may make you rich, but I’ll bet my seventy-five-cent mystery is a better buy.