Total U.S. money-market mutual-fund assets fell by $4.08 billion to $2.68 trillion for the week that ended Wednesday, according to the Investment Company Institute.

The seven-day average yield on money-market mutual funds was unchanged at 0.01 percent from the previous week, according to Money Fund Report, a service of iMoneyNet.

The seven-day compounded yield was flat at 0.01 percent.

The online service Bankrate.com said its survey of 100 leading commercial banks, savings and loan associations and savings banks in the nation’s 10 largest markets showed the annual percentage yield available on money-market accounts was unchanged from the week before at 0.11 percent.

The annual percentage yield available on interest-bearing checking accounts remained steady at 0.05 percent, Bankrate.com said.

The annual percentage yield on six-month certificates of deposit was unchanged from a week earlier at 0.15 percent.

One-year CD yields were also flat at 0.23 percent, and the yield on two-year CDs was unchanged at 0.37 percent.

The five-year yield was unchanged at 0.80 percent.