**Underlying Index Performance**: The primary driver is the performance of the underlying index tracked by the ETF. A rise in the index generally leads to an increase in the ETF's price, and vice versa.

**Supply and Demand**: Market demand for the ETF itself influences its price. High demand can push the price above its net asset value (NAV), while low demand can cause it to trade at a discount.

**Net Asset Value (NAV)**: The NAV, calculated based on the value of the ETF's holdings, serves as a benchmark for its fair value. Significant deviations between the market price and NAV create arbitrage opportunities.

**Investor Sentiment**: Overall market sentiment and investor confidence impact trading activity and, consequently, the ETF's price. Positive sentiment often leads to increased investment and higher prices.

**Trading Activity/Liquidity**: High trading volume and liquidity generally result in tighter bid-ask spreads and more efficient price discovery. Low liquidity can increase price volatility.

**Expense Ratio**: Although not a direct, immediate influence, the ETF's expense ratio affects its long-term performance relative to the index. Higher expense ratios can slightly dampen returns and affect investor demand.

**Currency Fluctuations**: If the ETF holds assets denominated in a foreign currency, fluctuations in exchange rates can impact its price when expressed in the local currency.

**Market Conditions**: Broader economic conditions, political events, and global market trends can indirectly influence investor behavior and the demand for the ETF.

**News and Events**: Specific news or events related to the companies included in the underlying index can cause price fluctuations in both the individual stocks and the ETF.