Question: Richest football club in the world by forbes?
Disambiguated questions and answers: question: Richest football club in the world by forbes in 2017?
Richest football club in the world by forbes in 2016?
Richest football club in the world by forbes in 2015?
answer: Manchester United
Real Madrid
Real Madrid
Natural Questions answer: Manchester United (from the Wikipedia article "Forbes' list of the most valuable football clubs")