This excerpt taken from the STLD 8-K filed Sep 8, 2005.
Base Rate means a fluctuating interest rate per annum in effect from time to time, which rate per annum shall at all times be equal to the higher of:
(a) the Prime Rate; and
(b) 1/2 of 1% per annum above the Federal Funds Rate.
If for any reason the Administrative Agent shall have determined (which determination shall be conclusive absent manifest error) that it is unable to ascertain the Federal Funds Rate, including the inability or failure of the Administrative Agent to obtain sufficient quotations in accordance with the terms thereof, the Base Rate shall be determined without regard to clause (b) of this definition, until the circumstances giving rise to such inability no longer exist. Any change in the Base Rate due to a change in the Prime Rate or the Federal Funds Rate shall be effective on the effective date of such change.