“…Some studies seek to identify the determinants of firms' decisions to cluster. In Indonesia, manufacturing firms have been shown to concentrate owing to access to more centralised locations, lower wages, larger local markets, better infrastructure (Henderson and Kuncoro 1996), greater technological spillovers, a higher degree of labour pooling, or a larger supply of inputs (Amiti and Cameron 2007). In addition, Deichmann et al (2008) point out that, in horizontal clustering, natural-resource-based industries benefit from what the authors call 'localisation effects'-that is, that farmers benefit from having neighbours with similar specialisations.…”