Credibility on the Line?

In today's column, Leo Zuckermann offers a detailed chronology of the erroneousness of Agustín Carstens' financial forecasts from February of 2008 up to the present day, before concluding:

I understand that the Treasury Secretary offers an optimistic vision of the economy so as not to deepen economic fears. Nevertheless, I think Carstens has abused optimism to the detriment of reality. He has consistently erred in his forecasts and with it has lost the credibility that a serious Treasury Secretary needs. Taking into account the past performance of Carstens, can we really believe that the Mexican economy will contract by only 5.5 percent in 2009?

This goes to something I posted about the other day. I still think it's premature to say he has lost all credibility and therefore can't be taken seriously, but it does seem as though his prognostications have been consistently more off-base than those of other nations.