More than half of South Asia's workforce is employed in agriculture, ranging from about 40 percent in Pakistan to nearly 70 percent in Nepal. But overall productivity is low, and the contribution of agriculture to the national economy averages only around 20 percent. Incomes in rural areas are much lower than in the towns and cities, and the same is true for the standard of living. With two-thirds of the realm's population living outside urban areas, most people either work in agriculture or rely on it indirectly ? Explain.