Until recent years, the DPRK patrolled this bordered harshly, and scope for bribes and corruption with border guards was very low. However, the stark economic situation on the Korean side has seen that change. For a price, DPRK border guards will let people through, and North Korean entrepreneurs (bless them) have been doing just that. According to the Sunday Telegraph, they are some of the best customers for Tesco Dandong in China, "They buy soap, toilet paper, shampoo and food, of course". This is what capitalism can provide, which totalitarian socialism cannot.
The nearly worthless DPRK won currency trades not at the official rate of 20.5 to the Chinese Renminbi, but 400.
The Economist this week also reports on the Koreas. It notes that North Korean society is in serious flux, because of the border becoming more porous and economic changes in neighbouring countries flooding through to the country in curious ways:
"Earlier this decade DVD players fell dramatically in price, so South Korean households quickly dumped their old VCRs in favour of the new players. Smugglers picked up the old units for next to nothing and sold them in North Korea for US$40 or so apiece - a price that plenty of urban North Korean familis could afford if they saved up. The consequence was what Mr Lankov (Australian National University) calls a "video revolution": a flood of South Korean soap operas, melodramas and music videos entering North Korea by the same route and delighting new audiences. The impact of the astounding affluence on display - the star's clothes and cars, Seoul's glittering skyline - exposes the central lie on which the regime bases its claim to rule: that South Korea is a backward, impoverished and exploited."
Tesco's slogan is "Every little helps", and it can say, in China, it's doing just that for North Koreans. It's far more than you'll notice most politicians in the West doing for them.