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Income is defined as personal net income and is divided into three categories:
-Low income is defined as the country-specific bottom third of the personal income allocation
-Medium income is defined as the country-specific average third of the personal income allocation
-High income is defined as the country-specific top third of the personal income allocation
ePublishing is defined as paid editorial/written content distributed over the internet, including eBooks (fiction, non-fiction & academic eBooks), digital editions (replicas) of consumer & trade/business magazines (eMagazines), and daily or weekly newspapers (ePapers). Open access content, paid content of newspaper or magazine websites and print or bundled subscriptions where digital editions come as a free extra and are not included.
Further information on methodology can be found