Whether existing multilateral trade commitments really deter larger trading nations from taking steps that further weaken cross-border commercial ties is assessed here. Evidence from salient commercial policy episodes of recent years is combined with information on the actual leeway available to G-20 members under extant World Trade Organization rules. The upshot is a bleak assessment of the capacity of the existing multilateral trade rule book to rein in any attempt by larger trading nations to “deglobalize” the world economy.