I know Japan likes red, but I'm surprised that the TSE uses green for a negative/falling connotation. That's not a Japanese cultural thing generally, AFAIK.

Is this just a historical path-dependent thing — e.g. stock-exchange trading floors traditionally all buying their sign boards from some specialty company that produced boards specialized to have exactly two "color channels" — red and green — and then, when the TSE got theirs, it was all they could do to just wire the color channels up backwards?

(I guess there are a few types of meters that always use red as high and green as low — e.g. pressure gauges. But that's because red in those cases means danger. A high stock value isn't dangerous!)