“If you have a large number of informed customers who know the best product choice, the longer queue—with more sales— likely includes more informed customers, so following the crowd is the right thing ...

Following the Dimson, Marsh and Staunton stock strategy requires monthly portfolio rebalancing. That means selling some stocks and buying others to ensure you keep the 20 best performers.

But just because the crowds may be rushing to the shops on 29 November through to Cyber Monday on 2 December to take advantage of special deals doesn’t mean you have to follow them blindly. This is ...