1. What do you think caused the large increase in the price of coffee in 1997?

2. Use supply and demand diagrams to explain 

(a) The fall in coffee prices in the late 1990s and early 2000s, and in the period 2011–13, and in 2015 and 2017; 

(b) The increase in coffee prices from 2004 to 2011, and in 2014 and 2016 and (if correctly predicted) from 2018