Constituent Stock Prices: 00918.TW tracks an index, so its price heavily depends on the prices of the stocks within that index. If the underlying stock prices rise, the ETF's price should generally increase, and vice versa.

Supply and Demand: General market forces of supply and demand also affect the ETF's price. Higher demand for the ETF pushes the price up, while increased selling pressure lowers it.

Index Tracking Accuracy: How closely the ETF mirrors its target index impacts price. Deviations from the index's performance can cause the ETF's price to differ from what's expected based solely on the constituent stocks.

Expense Ratio: The ETF's management fees, known as the expense ratio, can slightly affect its price over time. Higher fees might result in marginally lower returns compared to similar ETFs.

Market Sentiment: Overall investor confidence and risk appetite can influence ETF prices. Positive market sentiment often leads to increased investment in ETFs, potentially driving up their prices.

Dividend Payments: Dividends distributed by the underlying stocks in the index are typically passed on to ETF holders. These dividend payments can temporarily reduce the ETF's share price.

Currency Exchange Rates: Fluctuations in currency exchange rates can affect the price, especially if the ETF invests in companies listed in foreign markets.

Economic Conditions: Macroeconomic factors such as interest rates, inflation, and economic growth can influence the performance of the underlying companies and, consequently, the ETF's price.

Political Events: Major political events, policy changes, and geopolitical tensions can create market volatility and impact investor sentiment, affecting the ETF's price.