Self-tutoring about colour choices: the tutor inquires about worldwide favourites.
Blue is the most popular colour worldwide.
From country to country, the second-favourite colour varies: typically it’s red or green. Yet, in Hong Kong, it’s purple!
In both the US and China, the second favourite colour is green; in Britain, Australia, and Germany, it’s red. Harder to find is Canada’s second favourite, but the source I’ve perused suggests red.
Yellow sits far back, commonly behind fifth place.
Source:Oracle Tutoring by Jack and Diane, Campbell River, BC.