Underlying Asset Performance: The price of ESD.PA, an ETF tracking the MSCI Europe SRI index, is heavily influenced by the performance of the constituent companies within that index. If these companies' share prices rise, the ETF's price generally increases, and vice-versa. Supply and Demand: Basic market forces of supply and demand affect ESD.PA's price. High demand for the ETF pushes the price upwards, while increased selling pressure leads to price declines. Expense Ratio: The ETF's expense ratio, the annual fee charged to manage the fund, indirectly impacts its price. A higher expense ratio can slightly reduce returns over time, potentially making it less attractive compared to lower-cost alternatives. Index Rebalancing: Periodic rebalancing of the underlying MSCI Europe SRI index can lead to changes in the ETF's holdings. These adjustments, while designed to maintain index alignment, can temporarily impact the ETF's price as fund managers buy and sell specific stocks. Market Sentiment: Overall market sentiment towards European equities and socially responsible investing influences investor demand for ESD.PA. Positive sentiment generally drives up prices, while negative sentiment can lead to sell-offs.