3. look at the 5-year performance for chipotle. why do you think there was such a
huge decrease in price in january 2016?

Explanation:

In 2015, more than 700 people reported some kind of health problems due to eating in their restaurants, between 26-30 July. Many customers got E.coli due to food that's been kept in bad environment, which caused it to go bad, especially because it was left at high temperatures. They lost many customers, and their stocks went down.

Later, the old CEO was replaced by the new who came up with some interesting strategies in order to regain old fame and customers back.

The decreased price is a normal reaction, as people were too scared that something like that would happen again if they ate at their restaurants.