Good questions!
Regarding trading systems, most esperienced traders know that sometimes there are strong trends, making trend-following strategies the weapons of choice. And sometimes markets are “ranging”, requiring strategy adjustments, or even different strategies altogether. In the case of forex markets, we know that forex pairs — when they are trending — tend to trend strongly; but, that’s only about 30% of the time. The rest of the time, forex pairs tend to move about in ranges. Nevertheless, we look for organization (patterns) within this ranging behavior, and then we trade those patterns.
Unlike that clearly identifiable trending or ranging behavior, the “summer doldrums” often seem chaotic and disorganized. The market might look like it’s making a move, but then it just fizzles. Or, the market might appear to be in a clearly defined range, but then it just wanders in and out of its “range”, with no respect whatsoever for the “boundaries” of the range. Sometimes a pair acts like it just can’t get out of its own way. Words like [I]tired[/I], [I]listless[/I] and [I]directionless[/I] come to mind. It’s enough to make you want to take another look at Burton Malkiel’s “random walk” hypothesis.
If you are unaware of the summer doldrums, they can hurt you before you realize that something basic has changed in the market. On the other hand, if you know that this sort of thing overtakes the market almost every summer, then you can prepare.
The doldrums basically represent a lack of participation in the market by a significant number of big players. Some of the big players (the heavy-hitters, if you will) are just absent from the scene. Those who remain tend to trade less heavily than usual, further depressing trading volume. Some small, retail traders (guys like you and me) follow the lead of the pros, and either stay out of the market during the doldrums, or trade lightly and cautiously. Other retail traders fail to adjust, and get burned.
The simplest trading-system adjustment for coping with the doldrums is to shorten up the time-frame that you’re trading. Many trading systems and methodologies can be applied to almost any time-frame, and traders using such systems can adjust rather easily to the choppy and meandering markets typical of the doldrums.
And this leads into your question about scalping. The small momentum bursts that scalpers trade continue to occur during the summer doldrums, despite the fact that the markets seem to be going nowhere. It’s my impression that scalpers are the least affected, of all traders, by the pattern changes that occur in the forex market during the summer doldrums. But, I’m not a scalper; so, you might want to get a second opinion on that question.
About price-action trading vs indicator trading, I wouldn’t make a broad generalization and say that the summer doldrums favor one approach over the other. No doubt there are some ways of applying indicators, as well as some ways of applying price-action, which totally break down when markets become disorganized. Any system, indicator or price-action, which is based on identifying and following a trend, will break down when the trend breaks down. And any system, indicator or price-action, which is based on detecting and trading pattern-behavior within a horizontal range, will break down when those patterns break down.
Okay, my apologies for the rambling dissertation. You asked some good questions. I hope that somewhere in my ramblings you find the answers you’re looking for.