Market Interest Rates: Higher rates can decrease NMMIX.US's value as bond yields become more attractive, while lower rates can increase its appeal.

Credit Quality of Holdings: Downgrades in the credit ratings of bonds held by NMMIX.US can lead to price declines, while upgrades can boost its value.

Economic Conditions: Economic downturns can increase credit risk and decrease bond values in NMMIX.US, while strong growth can have the opposite effect.

Inflation Expectations: Rising inflation expectations can push bond yields up, lowering NMMIX.US's price, while decreasing expectations can increase it.

Fund Management Strategy: Active decisions made by fund managers, such as asset allocation, and security selection, will impact returns and therefore price.

Supply and Demand: High demand for NMMIX.US can increase its price, while increased selling pressure can decrease it.

Liquidity of the Fund: The ease with which NMMIX.US shares can be bought and sold impacts its price; low liquidity can lead to greater price volatility.

Overall Bond Market Sentiment: Positive sentiment towards the bond market generally will tend to increase the price while negative sentiment will lower it.

Changes in Fund Expenses: Higher fund expenses can reduce returns and lower the price, while lower expenses can have the opposite effect.

Maturity Profile: Longer-dated bonds in NMMIX.US are more sensitive to interest rate changes than shorter-dated ones, affecting the fund's price.