Underlying Asset Performance: The price of BIWM39.SA ETFs is primarily affected by the performance of the underlying assets it tracks. If the securities within its portfolio increase in value, the ETF's price will generally rise and vice versa. Supply and Demand: Market forces of supply and demand play a crucial role. Higher demand for the ETF typically leads to a price increase, while increased selling pressure or excess supply can result in a price decrease. Investor Sentiment: Overall market sentiment and investor confidence significantly influence ETF prices. Positive economic outlooks often drive increased investment, pushing prices upward, while negative sentiment can lead to sell-offs and price declines. Index Tracking Accuracy: How closely the ETF mirrors the performance of its target index is essential. Deviations from the index's performance, known as tracking error, can impact the ETF's price relative to its expected value. Expense Ratio: The ETF's expense ratio, which represents the annual cost of managing the fund, indirectly affects its price. Higher expense ratios can slightly reduce the overall returns compared to lower-cost alternatives.