Slave Market

In a slave market, an owner is showing his slaves for selling.
A man come to the shop and pointing to an American slave and asked, "how much he is?". The owner said, "$100". And the man pioint to a Russian slave, asked again, and the owner reply, "$1000". The man point to Japanese slave, and the owner reply , "$10000".
Finally the man point to a African slave and ask the price, the owner reply, "$100000".

The customer is confused and ask, "Why that black slave cost too much?".
The owner reply, "His brain is still new, he never used his brain".
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I don't mean to make someone feel bad.
Coz i am a afro-american :)