Non-market economy determination sets criteria for assessing market conditions and permits case-by-case application of market principles on evidence. The amendment requires the designated authority to account for the level of development of the country and product, defines 'non market economy country' and prescribes criteria for that determination-market responsiveness of firm pricing and input costs, legacy distortions of production costs and finances, legal certainty through bankruptcy and property laws, and market-rate exchange conversions-while allowing the authority, upon sufficient written evidence for particular firms in transitioning economies, to apply market-economy principles and permitting listed countries to submit evidence to establish market-economy status.