Sometimes I think people forget that they are people; they think that somehow technology will eliminate their foibles. ETFs have lowered costs for investors, but the greater ability to trade has enabled investors to more easily be greedy or panic.
Go ahead. Make trading free. Lessen further the frictions that inhibit bad trades.
If investing is free, would we create better asset allocation models? Costs are pretty low now, and I don’t see many imitating GMO, which has the best models of which I know.
Costs are already low now for common trades, and if you are willing to deal with poor customer service, you can trade cheaply in many places using Interactive Brokers. [I like Interactive Brokers. They are the cheapest, and where they are good, they are very, very good. Where they are bad, well...]
There is virtue to having some “sand in the gears,” i.e., things that hold us back from making too many adjustments to investments. If investing is free, then human nature will lack one more roadblock against bad decision-making.
Investors get fixated on explicit costs, and miss the implicit costs, which are often higher. Honestly, on any investment decision, you want to take time, and ask whether the change is worth it. Are you really on the right side of the trade? Just because there is little to no cost to do the trade, does that mean it is correct to trade?
Over the years, with ETFs, I have found that people trade more, and lose in trading. Jack Bogle was/is right regarding ETF clones of low cost mutual funds. To the degree that we encourage people to trade because of low transaction costs, the more we enable unintelligent fear and greed.
But As For Me
How would free trading affect what I do? It wouldn’t. The cost of trading for me is so low, that it does not figure into what I do. It is better in investing to think hard about your decisions, and make fewer of them. Thus I constrain myself to making major portfolio changes four times a year. It’s a big process, and I do it at mid-quarter. I think hard about the changes I make, and I make few of them, realizing that I am not immune to fear and greed.
This was written partially with an eye to an article at Abnormal Returns, which I rarely disagree with. My main point is that human nature is a much bigger factor in investing than costs. First learn to control human nature, if you can. Then control costs.