money market

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The trade in short-term, low-risk debt securities, such as commercial paper and US Treasury bills.
• noun A mutual fund that invests in short-term debt securities.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun finance A market for trading short-term debt instruments, such as treasury bills, commercial paper, bankers' acceptances, and certificates of deposit.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a market for short-term debt instruments