Thank you for reaching Fusion markets.
CPI is Customer price inflation, and it measures how much the prices of goods (such as food or televisions) and services (such as haircuts or train tickets) have gone up over time.
“When the market expects a number, and the actual result is different, this leads to a large increase in volatility and the price movement is rapid”.
I hope this answers your question. Any other inquiries, please let me know.