> I don't think this is a good example, because Brk A/B are clearly related (same company) and so that presents a perfect arbitrage opportunity. agree. what co

> I don't think this is a good example, because Brk A/B are clearly related (same company) and so that presents a perfect arbitrage opportunity. agree. what couples their prices is actually a bit of a mystery to me though, conversions from class a to class b are non-taxable so that keeps class b from mispricing above class a, but i think if you want to go from b to a you have to sell and then buy on the open market which then means that the misprice would have to be greater than any cap gains plus trading costs for an amount equal to one share of class a, which seems like, a lot. skimming the internet sure makes it sound like splits are associated with increased volatility and reverse splits are associated with decreased volatility, which seems to check out a bit with respect to the idea of increased or decreased minimum bets on the options markets.