Investors put $47 billion more cash into U.S. mutual funds in December 2007 than they took out, up from $45 billion in December 2006.

Net inflow increased to $29 billion, from $8.9 billion, at domestic stock funds, as net inflow fell to $17 billion, from $28 billion, at international and global funds, according to Financial Research Corp., Boston.

On the fixed-income side, tax-free bond funds suffered $3.6 billion in net outflow, compared with $1 billion in net inflow for December 2006.

Net inflow fell to $2.2 billion, from $8.8 billion, at corporate bond funds.

Government bond funds attracted $2.4 billion in net inflow, up from net outflow of $1.8 billion.

Net inflow at money-market funds increased to $49 billion, from $29 billion.