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Re:CoinDash’s ICO Website Has Been Hacked by ChrisClark on Monday July 17, 2017 @11:41AM (#14789545)
Though, the 24 hour trading volume for ETH is $1.5 Billion USD. So it won't affect the price as much as you'd think.
Re:CoinDash’s ICO Website Has Been Hacked by imron on Monday July 17, 2017 @11:50AM (#14789635)
$1.5 Billion, made up of many smaller transactions (~USD 15.5k on average according to this site [0]).

A number of large transactions to convert that much ETH to USD, would significantly affect speculator confidence, triggering others to sell.

0: https://bitinfocharts.com/ethereum/