This excerpt taken from the NDAQ 8-K filed Feb 20, 2008.
Note LMember credits
In June 2000, the Exchange implemented a member credit program that allowed certain Exchange members to receive a monthly credit of up to $1,000. The credit was applied against fees, dues, charges and other amounts owed to the Exchange, except fines, late fees, out-of-pocket expenses, pass-through costs, capital funding fees, payment for order flow fees, electronic communication network fees and fees for the print subscription of the Phlx guides.
During the years ended December 31, 2005 and 2004, the allowance of the member credit had no impact and a positive impact of $34,000 respectively, on the Exchanges results of operations. The member credit program was discontinued in May 2003.