Wal-Mart has demanded a freeze on across-the-board rate-increases from its US outside counsel, claiming that associate salary-hikes have had an unacceptable impact on law firm billing rates.

A memo sent out last week by the retail giant to the relationship partners at its network of outside counsel said that while the salaries firms chose to pay junior associates were “none of its concern”, the company was worried by the impact pay-rises were having on charge-out rates.