You guys are probably missing the swings because it is impossible to predict the market all the time. In hindsight you can always say...ohh! I missed that one, it was so obvious that it was going to come back down. But while it is teetering at a support or resistance you NEVER really know what is going to happen. Only after the fact do you see.
Swing trading in order to lower you average is not easy, it takes nerves of steel. Unless you are a seasoned trader and very savvy, you will most likely trade on emotion and end up losing shares the majority of the time.
Best strategy is to try and find cash to deposit to add shares. Otherwise just set it and forget it =)
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