How is it that China is supposed to be almost 20 dollars higher than the other exchanges, but every exchange still follows China's every move?
Are you looking at BitcoinWisdom?
The USD equivalent of Chinese prices is computed using some currency exchange rate. IIRC, BitcoinWisdom was obtaining the exchange rate from some standard site like Google or Yahoo. However, BitcoinWisdom's owner seems to be rather absent of late: he hasn't logged on bitcointalk since 2015-08-27, and his
most recent post was on 2015-07-14.
So, maybe the CNY:USD exchange rate is out of date. The CNY was recently devaluated, so that may explain the apparent discrepancy between Chinese and Western prices.
According to his
previous post, he seems to have succumbed to the Second Version Syndrome, a severe and often fatal occupational disease of software developers.
EDIT: according to
this chart, the yuan dropped relative to the dollar from 1:6.21 to 1:6.40 between 2015-08-09 and 2015-08-13. It then recovered a bit, gradually, to 1:6.35, and today had a sudden jump to 1:6.32.
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