Fund Performance: FAJYX.US's price is heavily influenced by its investment performance. Strong returns typically attract more investors, increasing demand and price.

Market Conditions: Overall market sentiment (bullish or bearish) and economic trends can significantly impact fund prices, including FAJYX.US.

Interest Rates: Changes in interest rates, particularly by the Federal Reserve, can affect bond yields and subsequently the appeal and price of bond funds like FAJYX.US.

Expense Ratio: The fund's expense ratio, which covers management and operating costs, can affect its overall returns and competitiveness, thereby influencing price.

Fund Manager Expertise: The fund manager's experience and investment strategy play a vital role. Skillful management can lead to higher returns and a more attractive fund.

Inflation Expectations: Inflation expectations influence bond yields, as investors demand higher returns to compensate for potential loss of purchasing power. This impacts bond fund prices.

Credit Risk: FAJYX.US's exposure to different credit qualities (e.g., AAA, BBB) impacts price. Higher risk bonds yield more but can cause price declines if default risks increase.

Fund Flows: Large inflows or outflows can impact the fund's ability to execute its investment strategy and potentially affect its price due to selling/buying pressure.