Bolivia is at the heart of South America. It extends from the high Andes to tropical jungle. It's culturally, ethnically and geographically very diverse and potentially rich. Yet it ranks lowest of all South American countries in the UN's Human Development Index. Twenty per cent of children are undernourished. Average school attendance is less than seven years. Entrenched vested interests hamper foreign investment in the economy, while the landlocked geography of the country itself limits access to export markets. But there are signs of change. Annual inflation fell from a peak of 23,500 per cent in 1985 to less than 4.5 per cent by the close of 1998, and Bolivia's huge external debt burden has been substantially eased under new debt redemption programmes.