Python Developer - HFT Trading firm - Chicago, IL

Emile van Sebille emile at
Sat Aug 21 20:01:01 CEST 2010

On 8/21/2010 10:32 AM Raymond Hettinger said...
> On Aug 21, 2:30 am, Lawrence D'Oliveiro<l... at geek-
> central.gen.new_zealand>  wrote:
>> Wasn’t HFT an exacerbating factor in just about every major stockmarket
>> downturn since, oh, 1987?
> IMO, it was a mitigating factor.
> HFT firms provide liquidity and help price discovery.
> Investor sentiment is what drives rallys and crashes.

Mitigating?  Trading applications that allow order-of-magnitude bad data 
through causing automated trading systems to follow suit dumping stock 
at a loss of billions sounds more like an instigating factor.

Investor sentiment _should be_ what drives rallys and crashes, and 
likely is over extended periods, but appears no longer to be the only 
factor in market volatility.


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