I found these definitions in the book.
Wealth measured by Cash-In-Hand or Quickly Realizable Assets
$100,000-$400,000 - the comfortable poor
$400,000-$1,000,000 - the comfortably off
$1,000,000-$2 million - the comfortably wealthy
$2 million-$10 million - the lesser rich
$10 million-$30 million - the comfortably rich
$30 million-$70 million - the rich
$70 million-$100 million - the seriously rich
$100 million-$200 million - the truly rich
Over $200 million - the filthy rich and the super rich
Wealth measured by total assets (true net worth)
$2 million-$4 million - the comfortable poor
$4 million-$10 million - the comfortably off
$10 million-$30 million - the comfortably wealthy
$30 million-$80 million - the lesser rich
$80 million-$150 million - the comfortably rich
$150 million-$200 million - the rich
$200 million-$400 million - the seriously rich
$400 million-$800 million - the truly rich
$800 million-$1,998 million - the filthy rich
Over $1,998 million - the super rich