Alongside the global tariff liberalization, a growing body of evidence demonstrates the rise in the use of non-tariff measures (NTMs), which suggests a substitution effect between these two import policy instruments. Yet, detailed economic data reveals that in countries with lower tariff rates (developed countries), the use of NTMs is significantly lower compared to developing countries, which implies a possible complementary effect between tariffs and NTMs across nations. Using a dataset of Kee, Nicita and Olarreaga (2009) on ad valorem tariff equivalents of NTMs, at a very disaggregated product level, this paper explores the determinants of NTMs and their substitutability/complementarity relations with tariff barriers. While exploiting the country variation, it demonstrates the decreasing trend of substitutability between the two import policy instruments with the rise in economic development. In particular, a significant complementarity correlation exists between the two trade measures among the wealthiest nations, implying a stronger commitment to freer trade.

Abstract. In recent years, the imposition of Non-Tariff Measures (NTMs) has increased rapidly both in quantity and importance. This development, with its considerable economic impact, particularly within the area of global trade, has prompted numerous scholars to explore the direction and magnitude of the trade effects of NTMs. Moreover, increased efforts are being placed on further exploring the determinants behind the use of NTMs, as well as their policy implications. The current paper aims to survey the empirical trade literature, in order to uncover the available responses to major questions regarding the trade effects of NTMs, principally of TBT and SPS measures. Among these questions posed are: (1) How do specific types of NTMs affect imports and exports? (2) Are developing countries more sensitive to NTMs? (3) Are small-medium sized firms more adversely affected by NTMs? (4) How are particular sectors/products affected by NTMs? And (5) Do Harmonization and Mutual Recognition necessarily impact trade positively?

Hydroxylapatite was evaluated in two separate parallel studies in humans as ridge maintenance implant materials. The techniques for the use of each, the methods of analyzing them and the postoperative results were reported and compared. Particulate H/A (20 mesh) served more reliably and predictably than the same material in cone form, when used in alveoli after dental extractions as an immediate grafting material for ridge maintenance in humans.

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