RE:RE:A's vs B'sI have been using this trading approach for years. Selling Bs and buying As when the difference was only a few cents and buying back Bs when the difference was much higher. Most of the time, the diffence was around 10 cents but occasionally the difference was only a few cents or dead even.
Still, I have seen A share being 30 to 40 cents higher than B shares whch was my signal to sell As and buy Bs. As an example, for a period of a few weeks prior to the split, A share prices were more than 25 cents higher than B shares.
The only problem with using this approach is that A share volume is usually very low and one needs to be vary patient to either buy or sell A shares