<prompt> Translate the following text to EnglishHata hivyo, kiwango cha faida cha kawaida kinatarajiwa kuwa kiwango cha faida cha kawaida, kwa kueleweka kwamba makampuni ya kawaida ya ufanisi yanaweza kufikia faida ya kawaida kwa muda.  <response>: expected to be a normal profit level, with the understanding that unusually efficient firms might achieve supra-normal profits for a time. 