Expense Ratio: Higher expense ratios directly reduce returns, impacting the fund's price negatively.

Underlying Bond Market: Changes in interest rates and credit spreads significantly affect the value of the bonds held in the fund, influencing its price.

Credit Quality: The fund's holdings are primarily mortgage-backed securities, and the creditworthiness of these mortgages impacts the fund's perceived risk and price. Downgrades or concerns about defaults can lower the price.

Duration: TGDFX has a specific duration. Rising interest rates negatively affect funds with longer durations, leading to a price decline.

Inflation Expectations: Increased inflation erodes the real value of fixed-income investments, potentially causing a decline in the fund's price.

Fund Flows: Large inflows or outflows of investor money can impact the fund's need to buy or sell securities, influencing the price.

Management Strategy: Active management decisions related to security selection and portfolio allocation can affect the fund's performance and price.

Economic Conditions: Overall economic growth, employment levels, and housing market trends affect mortgage-backed securities and the fund's price.

Mortgage Rates: Changes in mortgage rates directly influence the value of mortgage-backed securities, impacting the fund's price.

Prepayment Risk: The possibility of homeowners refinancing their mortgages affects the fund's expected cash flows and yield, influencing the price.