Fig 1. The relationship between log price and log abundance of alien and native species recorded in Taiwan.

Red circles indicate the alien species and black triangles indicate the native species for sale in Taiwanese pet shops. The line indicates the best fit relationship between log price (in Taiwanese Dollars, or TWD) and log numbers irrespective of native or alien status (r² = 0.27, n = 217). Both transformations are natural logarithms.