The markets are up and down

I can't make head nor tail of it. If only Dave was here to guide me ...

Down yesterday, back up tonight

Dave could paint too

Dave painted in oils, watercolours and he also drew with pastels.

This is one of his pictures that I have at home, his signature says it was painted in 1993.
It was on display at my house in Park Avenue and now I've reclaimed it from storage for my study.