Answer — Exercise 1

The man has short hair at the side, long on top with a flick, tattoos and a long beard (all very popular trends among young men in 2015).

Trends may begin because:

• a celebrity wears a certain style
• a film or TV show popularises something
• something trends on Twitter or another social network
• a major sporting occasion such as the World Cup starts trends
• sometimes they start as a joke or a serious world event may affect how people feel about life and the world and cause a trend.

Explanations for the rise, peak and fall are provided in the text.