Market interest rates: When interest rates rise, bond prices tend to fall, as newer bonds offer more attractive yields, impacting FSZWX.US, which invests in bonds.

Economic outlook: Strong economic growth can lead to higher inflation expectations and potentially higher interest rates, negatively affecting bond prices and FSZWX.US.

Inflation expectations: Higher inflation erodes the purchasing power of future bond payments, causing bond prices, and therefore FSZWX.US, to decrease.

Credit risk perception: Changes in the perceived creditworthiness of bond issuers held by FSZWX.US can affect the fund's value, with downgrades leading to price declines.

Fund management decisions: Decisions regarding asset allocation, security selection, and duration management can impact FSZWX.US's performance and price.

Investor sentiment: Shifts in investor confidence or risk aversion can drive flows into or out of FSZWX.US, impacting its supply and demand, subsequently affecting its price.