LUANG PRABANG — Although Laos will soon to join the World Trade Organization, in economic terms it remains very much Southeast Asia’s forgotten country, a landlocked backpacker magnet of unexploded ordnance and winding roads, nicely topped off by stunning jungle, river and mountain vistas. Lying between China, Vietnam, Cambodia, Burma and Thailand, Communist-ruled Laos has worked off what economists like to call “a low base,” with the country’s economy averaging 7-8 percent gross domestic product growth, built on hydropower development – which has raised the hackles of international environmentalists – and a mining boom. The ruling Lao People’s Revolutionary Party (LPRP) started opening slowly to the outside world in the late 1980s, around the same time as neighboring Vietnam’s doi moi or renovation reforms got underway, in which a similar one-party Communist regime slowly liberalized parts of its economy. But despite the parallel paths, Vietnam’s much bigger economy – though recently struggling with slowing growth, graft scandals and inflation – is much more diversified than that of Laos. One of the world’s poorest countries, Laos’ annual per capita gross domestic product by purchasing power parity is just US$2,700 per year, ranking it 177th in the world and well below Vietnam’s US$3,400.