From the Wall Street Journal:
White covers in particular recede against the white backgrounds of Amazon and other online retailers. But yellow jumps off online pages and it can support both dark and bright type and graphics. Also, it carries no gender association and can signify anything from sunshine and optimism to a danger warning, making it a strong choice for a variety of genres and topics.
The Journal credits Marlon James’ Man Booker Prize-winning “A Brief History of Seven Killings” as one of the pioneers in the recent yellow trend. Since that book hit shelves in 2014, it’s been joined by many fellow yellows.
Article Appeared @http://www.mprnews.org/story/2016/06/07/books-yellow-covers-trend