K E Y W O R D Sheterogeneity, intrafirm trade, productivity, services trade
| INTRODUCTIONParalleling the growth of the service sector in the economy, trade in services is increasing rapidly. According to WTO statistics, from 1980 to 2014, world exports of services grew by 7.9% per annum, a rate that exceeded the annual growth rate of goods exports globally (6.8%). 1 Likewise, the ratio of services exports to goods exports increased from 18% in 1980 to 26% in 2014. In 2014, Japan ranked fourth in goods exports but seventh in services exports, indicating a relatively low presence in world trade in services. However, the annual growth rate of Japan's services exports (6.5% from 1980 to 2014) exceeded that of goods exports (5.0%). When looking at the composition of the services exports of Japan in the 2014 balance of payments (BOP) statistics, the shares of sea transport, charges for the use of intellectual property, and other business services all exceeded 20% of total services exports (see Appendix Table A1). 2 As the majority of services are characterised by the simultaneity of production and consumption, services transactions generally require the proximity of supplier and consumer, meaning that the geographical distance matters more than for the transaction of goods. Moreover, the cultural and institutional distance may impose an additional burden on services trade. In contrast to goods trade, where tariffs and nontariff barriers have been substantially reduced through multilateral and bilateral trade negotiations, a large number of services are still subject to public regulations. Furthermore, given that the regulations and standards imposed on services differ markedly by country, the barrier to crossing a national border is higher for services trade than it is for goods trade.Van der Marel and Shepherd (2013), for example, estimate a gravity model of trade using crosscountry data and indicate that distance has a larger negative effect on services trade than it does on goods trade. Miroudot, Sauvage, and Shepherd (2013) present evidence that trade costs in services, in ad valorem terms, are approximately twice as high as those in goods. Anderson, Milot, and Yotov 1 These figures are calculated from the merchandise trade and the trade in commercial services data taken from the "International Trade and Market Access Data" (World Trade Organization). 2 The General Agreement on Trade in Services (GATS) defines services trade as consisting of four modes: (i) direct crossborder trade in services; (ii) movement of the customer to the country of the provider; (iii) sales of services through an offshore affiliate; and (iv) (temporary) movement of (natural) persons to provide services (Article 1). However, the services trade recorded in the BOP statistics does not necessarily cover all the services defined by the GATS. Lipsey (2009) explains the various problems associated with measuring services trade.