How your period is making other people rich

People have been tracking their cycles since periods were a thing. These days, menstrual cycles have become big business, and there are lots of ways to profit from them. The rise of fertility-tracking apps mean companies have data on the most intimate aspects of our lives. And marketers are learning how to exploit subconscious hormonal drives to sell us stuff we aren't even aware that we want Subscribe to The Guardian on YouTube ► http://bit.ly/16bR3Lu Support the Guardian ► http://bit.ly/2G1wx4T Today in Focus podcast ► http://bit.ly/2VlqjTf Sign up for the Guardian documentaries newsletter ► http://bit.ly/2feoDdN The Guardian ► http://bit.ly/1AFLGzy The Guardian YouTube network: Guardian News ► http://bit.ly/1J9JUwL Owen Jones talks ► http://bit.ly/subsowenjones Guardian Football ► http://bit.ly/1yECE17 Guardian Sport ► http://bit.ly/GDNsport Guardian Culture ► http://bit.ly/16bR6H2