Interest Rates: Rising interest rates generally decrease bond prices, as newly issued bonds offer higher yields, making existing bonds less attractive.

Credit Quality: Changes in the creditworthiness of the bond issuers within the fund's portfolio directly impact the fund's price; downgrades lead to price declines.

Inflation Expectations: Higher inflation erodes the real value of future bond payments, causing bond prices to fall to compensate for this risk.

Economic Growth: Stronger economic growth can lead to higher interest rates and inflation expectations, both of which negatively impact bond prices.

Market Sentiment: Overall investor risk appetite can influence bond prices; risk-averse sentiment often increases demand for bonds, pushing prices up.

Fund Management: The fund manager's investment decisions, including security selection and duration management, affect performance and thus price.

Supply and Demand: The balance between buyers and sellers in the bond market can cause short-term price fluctuations, affecting JNVSX.US.

Maturity Dates: Bonds with longer maturity dates are more sensitive to interest rate changes, influencing JNVSX.US which likely invests in long term bonds.

Global Events: Geopolitical instability or significant global economic events can trigger shifts in investor sentiment, influencing bond prices globally.