Economy: Economic growth typically boosts stock values, benefiting IYSMX. Slowdowns or recessions can negatively impact performance.

Interest Rates: Rising interest rates can make bonds more attractive, potentially leading investors to sell stocks, hurting IYSMX. Falling rates can have the opposite effect.

Inflation: High inflation erodes purchasing power and can pressure companies' earnings, possibly lowering stock prices within IYSMX.

Market Sentiment: Overall investor optimism or pessimism significantly influences stock prices. Bull markets can lift IYSMX, while bear markets can depress it.

Company Performance: The financial health and growth prospects of individual companies held by IYSMX directly impact its value.

Sector Trends: Performance of the sectors in which IYSMX invests impacts overall fund price.

Geopolitical Events: Global events, such as wars or political instability, can create uncertainty and volatility in financial markets, affecting IYSMX.

Fund Flows: Large inflows of money into IYSMX can drive up prices, while significant outflows can force the fund to sell holdings, potentially lowering its value.

Management Expertise: The skill and experience of the fund managers in selecting and managing investments influence IYSMX's performance.

Currency Fluctuations: Changes in currency exchange rates can impact the value of international stocks held within IYSMX, especially for non-US investors.