Errors in the Textbook
Perman, Ma, Common, Maddison and McGilvray
NATURAL RESOURCE AND ENVIRONMENTAL ECONOMICS
Page 73, 3rd paragraph. It should say: "(...) by subtracting utility from person B and adding this to person A" (and not the other way round).
Page 85, 2nd paragraph. It should say Figure 3.10 and not 3.8
(Many thanks to Lisset Montoro for alerting the authors to these errors.).