THE HIDDEN COSTS OF TRADE: HOW NON-TARIFF BARRIERS CONSTRAIN THE INTERNATIONALISATION OF SMALL AND MEDIUM-SIZED ENTERPRISES

As successive rounds of multilateral negotiation pushed average industrial tariffs down from the double digits of the immediate post-war years to low single figures, the frictions that decide who trades and who does not have quietly migrated. They have moved off the customs schedule and into the rule book. This paper follows that migration and asks what it has meant for small and medium-sized enterprises (SMEs). Drawing on the literature on non-tariff measures, firm heterogeneity, and trade facilitation, it argues that non-tariff barriers (NTBs) are now the principal hidden cost of international trade, and that their incidence is sharply regressive. Because most compliance obligations (certification, laboratory testing, product adaptation, documentation, and the management of border delay) are fixed and largely sunk, they cannot be spread across the modest volumes that SMEs typically ship. The very rule that a multinational absorbs at a fraction of a cent per unit can add tens of dollars to each unit a small exporter sells, pricing the smaller firm out of a market before its first consignment has even cleared. Using the framework of firm heterogeneity set out by Melitz, the paper shows how NTBs raise the productivity threshold required to export and, in doing so, segment markets in favour of large, asset-rich firms. It distinguishes five categories of hidden cost, traces their operation across agriculture, manufacturing, and cross-border e-commerce, reviews the strategies SMEs use to survive, and proposes an SME-centred policy agenda built on regulatory convergence, mutual recognition, and the digitalisation of trade procedures.