"As people watch asset prices rise and people make money herding mentality kicks in and many people jump on the bandwagon with hopes of grabbing some of the ric

"As people watch asset prices rise and people make money herding mentality kicks in and many people jump on the bandwagon with hopes of grabbing some of the riches." A few too many mixed metaphors in this article! I'm trying to imagine herds of people jumping on a bandwagon... What is a bandwagon anyway, I realise now I've never known - it's only ever used in the phrase/cliche "jumping on the bandwagon".