Figure 2

Geographical distribution of the communes in the different components of the commune-commune network (Network 2). The highly connect core of communes (giant weak component) includes 44.8% (138/308) of nodes, linking 90(69%) communes and 48(41%) traders included in the study. The second component includes 14%(43/308) of nodes, linking 21(16%) communes and 22 (19%) traders included in the study; the other components (28 in total) have 10 or less nodes with 19 components of five or less nodes. Inset: North Vietnam study area.