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For awhile there it looked like it might happen just a few days ago as BTC dropped from near $8,000 to under $6,000 and Bitcoin Cash went from $500 to $2,200. They were only 3-4 thousand dollars apart. I thought they might cross! :-)
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The Bitcoin Cash price rise that you are talking about was the result of heavy market manipulation.
More than 40 % of the volume of BCH occured at Bithumb, a Korean Bitcoin exchange, that offers the possibility
to trade with zero fees (or buy vouchers that enable you to do this). This enables rampant wash-trading, which makes
it really easy to manipulate the prices. These manipulations distort the prices at other exchanges as well, because every
price discrepancy between exchanges obviously creates arbitrage opportunities.
If you don´t believe me, look into my post history where I showed a screenshot of the Bithumb user interface where
you can see the option to buy zero trading fee vouchers.