“…Causes of illegal dumping. Illegal dumping is hypothesized to be associated with disposal costs (Crofts et al, 2010;Ichinose & Yamamoto, 2011;Karagiannidis, et al, 2005;Kim et al, 2008), fines (Crofts et al, 2010;Ichinose & Yamamoto, 2011), disposal restrictions (Sigman, 1998), accessibility (Jorda-Borrell et al, 2014;Matos et al, 2012;Tasaki, et al, 2007), population density (Jorda-Borrell et al, 2014;Matos et al, 2012;Tasaki, et al, 2007), surveillance (Crofts et al, 2010;Jorda-Borrell et al, 2014;Matsumoto & Takeuchi, 2011), unemployment (Matsumoto & Takeuchi, 2011), and income (Jorda-Borrell et al, 2014;Karagiannidis, et al, 2005;Tasaki, et al, 2007).…”