The WTO adjudicating bodies faced some very tough questions in 2016: the status of non-market economies, the consistency of policies aiming to address tax evasion with the WTO, and the clash between environment and trade policies were all on the menu. Old issues, like the consistency of zeroing, resurfaced as well, albeit with a twist this time, since the Appellate Body (AB) had to address the question whether zeroing is consistent with the WTO when practiced in the realm of a methodology that was so far untested.