The man asks: "How much is the yellow one?"
The assistant says: "$2000."
The man is shocked and asks the assistant why it's so expensive.
The assistant explains: "This parrot is a very special one. He knows typewriting and can type really fast."
"What about the green one?", the man asks.
The assistant says: "He costs $5000 because he knows typewriting and can answer incoming telephone calls and takes notes."
"What about the red one?", the man asks.
The assistant says: "That one's $10,000."
The man says: "What does HE do?"
The assistant says: "I don't know, but the other two call him boss."