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The steem system doesn't treat steemdollars like 1 USD. See below.

Another Updated Source

Steem dollars are basically IOUs for however many steem tokens it takes to give you a USD worth of value when you cash out. If steem tokens are trading for $0.50 and you go to cash out one steem dollar the steemblockchain protocal will give you 2 steem tokens in exchange for your 1 steemdollar leaving you with 1 USD worth of steem token.

You just contradicted yourself and confirmed what I said. :]

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