Underlying Asset Performance: The price of MTA.PA is heavily influenced by the performance of the underlying assets it tracks. If those assets rise in value, the ETF's price will likely increase.

Supply and Demand: Market forces of supply and demand play a significant role. Increased demand for MTA.PA pushes its price up, while increased supply leads to a price decrease.

Investor Sentiment: Overall investor sentiment and market conditions impact the demand for and perceived value of MTA.PA, affecting its price.

Index Changes: Revisions or adjustments to the index MTA.PA tracks can lead to price fluctuations as the ETF rebalances its holdings.

Expense Ratio and Tracking Error: The ETF's expense ratio and how closely it tracks its underlying index affect its attractiveness and price.

Currency Fluctuations: If the underlying assets are priced in a different currency, exchange rate fluctuations can affect the ETF's price.

Economic Factors: Macroeconomic factors like interest rates, inflation, and GDP growth can influence investor sentiment and asset values, affecting MTA.PA's price.