*ETFs trading: countries: France, Poland, Belgium, Portugal, Netherlands, Germany, Italy, Luxembourg

ETF prices, like stock prices, are determined by market supply and demand. In general, the price of an ETF is closely related to the value of its underlying assets. The price of an ETF might fluctuate throughout the trading day due to variables such as changes in the prices of the underlying securities, market sentiment, and investors demand.

Additionally, another factor to consider is the Tracking Error. It measures how closely an ETF tracks its intended benchmark index. Examining this indicator can help to reveal the degree of alignment between the ETF's performance and its benchmark.