From my experience doing group study for classes, there don't seem to be any major advantages or disadvantages for pairs vs small groups. The most relevant factor is how many eyeballs looking at something, but even that isn't a huge effect. Both are more effective than working alone (as the article concludes).
For a lot of things, getting together IRL looks like it would work best, but the logistics there can be difficult. For people who have Lesswrong meetups nearby, those are an obvious way to potentially coordinate meatspace study groups.
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David Brin believes that high speed trading bots are a high probability route to human indifferent AI. If you agree with him, then laws governing the usage of high speed trading algorithms could be useful. There is a downside in terms of stock liquidity, but how much that will affect overall economic growth is still a research area.
I see trading bots as a not unlikely source of human indifferent AI, but I don't see how a transaction tax would help. Penalizing high frequency traders just incentivizes smarter trades over faster trades.