Good question BF.
In my years of trading, here's what I've decided - Mon and Fri are no different than the rest of the week. You have no idea going into the week what days will be active and when it won't be. Just when you think you got it pegged, you will be wrong.
Few examples...
- You'll read that before/during/after holidays is a bad time to trade.
- You'll hear that summer is a bad time to trade.
- You'll hear that Spring is a bad time to trade b/c Summer is around the corner.
- You'll hear that trading during lunchtime hours is a bad idea.
- etc. etc. etc.
And what I have personally found out is that as soon as you make any type of assumption of what the market may do that day, week, or month, it will surprise you. Then your mind plays games with you. I remember when I used to assume that trading before a holiday was bad, so I would avoid it or trade less. Sometimes it was slower, sometimes it wasn't. Now, if I assumed that it was a bad idea to trade, but turned out to be good, then your assumption for what the week after is all messed up now. Let me lay it out like this:
- You say to yourself no trading before a holiday.
- You watch the market provide incredible trading opportunities, but you must watch b/c you said no trading.
- Initially you assumed that the week after would be best.
- Now, you aren't so sure b/c the week before was best.
- So, what do you do now? Trade or not? Either way, you will be wrong.
So, after years of playing these games, I said screw it and just trade each day like it was a 'normal' day. You just simply do not know which days will be best for your trading until the day is over. You have to be in the game in order to win.
That's what I found out at least. You may find that your trading setups simply are not reliable during certain timeframes and you are the only one that can figure that out. The guys that say don't trade Mondays, Fridays, lunchtime, etc. either know that it does not work for them (so it must not work for anyone) or they've been told not to trade during these times, so they don't.
Here's an example from Fri - Fri afternoons are often referred to as a time to avoid. And back in the day, I avoided them b/c everyone said to. Well, on Friday I got a nice +2pt move on the ES that took very little time to occur. Getting +2 on the ES with ease was a great way to end the day.
Note - sometimes you'll find that the 'bad' times are some of the easiest times to make quick money. I'll let you figure out why that is...