For a system to work it has to have broad application - I suggest that within the US there are a signficant number of people who wouldn’t be in a position to use an electronic system and internationally there are more that couldn’t than those that could - remember passbook banking - it still exists!!
The PPT or "Plunge Protection Team" steps in around noon on down days and pumps the market uo. This is just one of the manipulation tools used to destroy the credibility of the Free Market System."