Two-way trade between North and South Korea, legalized in 1988, hit almost $1.82 billion in 2008, much of it related to out-processing or assembly work undertaken by South Korean firms in the Kaesong Industrial Complex (KIC). A significant portion of the total through 2007 included R.O.K. Government aid, but that assistance stopped in 2008, except for energy aid (heavy fuel oil) under the Six-Party Talks. Thus, in 2008, about 94% of the total trade consisted of commercial transactions, much of that based on processing-on-commission arrangements and the light industry operations in KIC. The R.O.K. is North Korea's second-largest trading partner, after China.
Since the June 2000 North-South summit, North and South Korea have reconnected their east and west coast railroads and roads where they cross the DMZ and have improved these transportation routes. North and South Korea conducted tests of the east and west coast railroads on May 17, 2007 and began cross-border freight service between Kaesong in the D.P.R.K. and Munsan in the R.O.K. in December 2007, but the connection remains symbolic rather than commercial. Much of the work done in North Korea has been funded by South Korea. The west coast rail and road are complete as far north as the KIC (just north of the DMZ), but little work is being done north of Kaesong. On the east coast, the road is complete but the rail line is far from operational. Since 2003, tour groups used the east coast road to travel from South Korea to Mt. Geumgang in North Korea, where cruise ship-based tours had been permitted since 1998. Since then, more than a million visitors have traveled to Mt. Geumgang. The R.O.K. suspended tours to Mt. Geumgang in July 2008, however, following the shooting death of a South Korean tourist at the resort by a D.P.R.K. soldier. As of February 2009, 101 South Korean firms including apartment-type factories were manufacturing goods in the KIC, employing more than 39,000 North Korean workers. Most of the goods are sold in South Korea; a small quantity is being exported to foreign markets. Ground was broken on the complex in June 2003, and the first products were shipped from the KIC in December 2004. Initial plans envisioned 1,500 firms employing 350,000 workers by 2012, but expansion has been slowed because of tense inter-Korean relations.
http://www.state.gov/r/pa/ei/bgn/2800.htm