QUESTION: So is there any difference between a Robot and a person trading if they just follow the same system on a single market?
ANSWER: Any system that is created which claims to be some robo-trading system is vulnerable to a contagion that impacts a given market from external sources. We are entering a highly correlated global capital flow era which events external to a domestic market can overwhelm a domestic economy and any market.
The only difference between a robo-trading system and a human is that the human can get all emotion and panic. The computer would not do that, but it would be vulnerable to external forces and would not be able to make a judgment call.
The only possible way to overcome this is a complete global model which is monitoring everything and will pick up the external contagions. You can visually see this using the Global Market Watch. You can glance at the trends in all world stock markets for example on one page.