Techniques of Tape Reading

What is tape reading? I heard my grandfather talking about it once. He was talking with another old man how they made other people read off tapes what they wanted them to. You know, buy, buy, buy, buy, while the other one was selling, selling, selling selling, until some sucker came in and started buying, buying and then both started selling, until the succker sold and they bought it back and shared the profits.
 
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