Underlying Assets' Performance: The price of 00858.TWO closely tracks the net asset value (NAV), which depends on the prices of the underlying companies it holds. If those companies perform well, the ETF price will likely increase, and vice versa.

Supply and Demand: Like any other security, the ETF's price is influenced by supply and demand in the market. Higher demand relative to supply will push the price up, while higher supply will push it down.

Market Sentiment: Overall investor sentiment towards the Taiwanese stock market and technology sector can influence the ETF's price. Positive sentiment may lead to increased investment and a higher price.

Expense Ratio: While not directly impacting the daily price, the expense ratio impacts long-term returns. Higher expense ratios can reduce the ETF's overall performance and potentially its attractiveness to investors.

Tracking Error: Tracking error, the difference between the ETF's return and the return of its benchmark index, can influence investor perception and, consequently, the ETF's price. Smaller tracking error is generally preferred.

Currency Fluctuations: As the ETF holds Taiwanese companies, currency fluctuations between the New Taiwan dollar and other currencies can affect its price, particularly for foreign investors.