Constituent Stock Prices: MDEV.US tracks an index of emerging market developer companies. The ETF's price is directly affected by the underlying prices of those stocks.

Supply and Demand: High demand pushes the price up, while increased selling pressure can lower it.

Index Changes: Changes to the underlying index MDEV.US tracks, such as additions or deletions of stocks, will impact its price.

Fund Flows: Large inflows of money into the ETF typically increase the share price. Outflows tend to decrease it.

Emerging Market Sentiment: Broad market sentiment towards emerging market economies significantly affects investor interest and ETF price.

Currency Fluctuations: Exchange rate changes between the USD and the currencies of the emerging market companies affect the ETF's value.

Economic Factors: Emerging market economic growth rates, interest rates, and inflation data can all impact stock valuations and thus the ETF price.

Geopolitical Risks: Political instability or geopolitical events within emerging markets can lead to volatility and impact investor confidence, affecting ETF value.