Depends on liquidity as the previous poster suggested, usually quite reliable give or take slippage.
The biggest risk lies in unexpected gaps against you if swing trading.
FoN
I've always seen it like this.
Gambling is when you have negative expectancy and you hoping that luck makes you money on any given play, usually a product of addiction.
Trading is when you have proven positive expectancy and you know that over the course of time luck or no luck you will...