Underlying Index Performance: The primary driver is the performance of the underlying index it tracks. A rise in the index value typically increases the ETF price, and vice-versa.

Supply and Demand: Market demand for the ETF compared to its supply influences the price. Higher demand generally leads to a price increase, while higher supply can decrease it.

Net Asset Value (NAV): The ETF's NAV, calculated by dividing the total value of its holdings by the number of outstanding shares, acts as a theoretical fair value. Deviations between the market price and NAV create arbitrage opportunities, which tend to bring them closer together.

Interest Rates: Changes in interest rates can affect the valuations of companies within the underlying index, and consequently, the ETF's price.

Economic Conditions: Overall economic health, including factors like GDP growth, inflation, and unemployment, impacts investor sentiment and the performance of companies in the underlying index.

Currency Fluctuations: If the underlying assets are denominated in a currency different from the ETF's trading currency, exchange rate movements can affect the ETF's price.

Investor Sentiment: General market optimism or pessimism can drive investment flows into or out of the ETF, impacting its price independently of the underlying index's performance.

Expense Ratio: While not directly impacting the daily price, a higher expense ratio can reduce the long-term returns of the ETF, indirectly affecting its attractiveness to investors.