# Difference between chained CPI and normal CPI in simple terms

I am taking a community college level intro to macro course, and while self-studying the text, I came across the concept of C-CPI or chained CPI. While I feel I have a grasp as to what CPI is, I have found explanations of chained CPI confusing.

Can anyone ELI5 (explain like I'm 5)?

• This might help. – luchonacho Sep 22 '17 at 11:41

Suppose we are calculating the CPI using a basket of goods that contains only cinema tickets. Last year a cinema ticket cost \$15, but now it costs \$30. The CPI would then have doubled to reflect that fact that the prices in the basket of goods have doubled.