Market Interest Rates: Rising interest rates typically decrease bond values and thus GMAMX.US's price.

Credit Quality: Downgrades in the creditworthiness of bonds held by the fund can lower its net asset value.

Economic Growth: Strong economic data may lead to expectations of higher interest rates, decreasing bond prices.

Inflation Expectations: Rising inflation erodes the purchasing power of fixed income, negatively impacting GMAMX.US.

Fund Management: The fund manager's investment decisions impact returns.

Supply and Demand: Investor demand for bond funds affects the fund's price.

Geopolitical Events: Global instability can lead to flight-to-safety investments, increasing demand for US bonds and thus potentially increasing the fund's price.

Changes in Fund Composition: Significant shifts in the fund's holdings influence its performance.

Liquidity of Underlying Assets: Difficulty in selling the underlying bonds can lower the fund's value.

Fund Expense Ratio: Higher expenses detract from overall returns.

Maturity Profile: Longer-dated bonds are more sensitive to interest rate changes.

Currency Fluctuations: The currency that a fund's assets are valued in, affects price.