By Barbara Cohen
While HFTs may argue that they bring liquidity to the Market, they cannot dispel the concerns that liquidity comes at a very high price to investors – increased volatility. In a report issued in September 2011, associate professor Frank Zhang of Yale University stated that once an instrument’s share volume exceeds 50%, trading becomes basically a “hot potato,” as HFTs trade the same positions, passing them back and forth amongst themselves. Inter-firm trading all but eliminates “Price Discovery,” determining share price by normal supply and demand factors, such as news events or positive/negative earnings releases.
Inter-firm high frequency trading also wreaks havoc for Main Street investors because of “cross spreading.” So many liquid stocks, such as BAC and MSFT, now execute in milliseconds, resulting in extreme “competition” for Main street investors. Queues to enter and exit are significantly longer, with hundreds of shares waiting to execute. Long queues force Main Street investors into the vulnerable position of having to buy at the offer or sell at the bid, a trading method known as “crossing the spread.”
via How High Frequency Trading Robots Are Creating a Bumpy Ride for Main Street – NASDAQ.com.

Colin Twiggs is a former investment banker with almost 40 years of experience in financial markets. He co-founded Incredible Charts and writes the popular Trading Diary and Patient Investor newsletters.
Using a top-down approach, Colin identifies key macro trends in the global economy before evaluating selected opportunities using a combination of fundamental and technical analysis.
Focusing on interest rates and financial market liquidity as primary drivers of the economic cycle, he warned of the 2008/2009 and 2020 bear markets well ahead of actual events.
He founded PVT Capital (AFSL No. 546090) in May 2023, which offers investment strategy and advice to wholesale clients.