Estimating national wealth : methodology and results ... National wealth takes on a much broader definition and is embodied in natural capital...
web.worldbank.org/servlets/ ECR?contentMDK=20393160&sitePK=407255

My conclusion: As long as productivity growth stays strong, national wealth will grow fast enough to sustain these current account deficits. ...
www.businessweek.com/the_thread/ economicsunbound/archives/2005/07/not_so_scary.html

Definition, National wealth is the sum, for the economy as a whole, of non-financial assets and net claims on the rest of the world. Paragraphs, 13.2.
unstats.un.org/unsd/sna1993/glossform.asp?getitem=645