the most-favoured-nation (MFN) applied rate of customs duty on the product concerned in effect at the time the measure is taken, or
ráta dleachta custaim an náisiúin bharrfhabhair (NBF) a chuirtear i bhfeidhm maidir leis an táirge lena mbaineann agus atá i bhfeidhm an tráth a ndéantar an beart; nó