Underlying Index Performance: CP9.PA’s price is primarily driven by the performance of the underlying index it tracks. A rise in the index leads to a rise in the ETF’s price and vice-versa.

Supply and Demand: Market forces of supply and demand impact CP9.PA's price. Higher demand relative to supply will push prices up, while increased selling pressure can decrease the price.

Investor Sentiment: Overall investor sentiment towards the assets represented by the index also affects CP9.PA. Optimism will lead to higher buying and pessimism to more selling, impacting the price.

Currency Exchange Rates: For international ETFs, currency fluctuations between the ETF's currency (Euro) and the underlying assets’ currencies can impact the price, affecting returns for non-Euro investors.

Expense Ratio and Tracking Error: The ETF's expense ratio reduces returns, and any deviation between the ETF's performance and the index (tracking error) can influence its price relative to its intended benchmark.