Table 1.

Protocol used.

Item	Description
Time period	2004 to 2021
Boolean Operations	AND OR
Search field	(Digital AND Economy) AND (statistics or measure or measurement or measuring or GDP)
Type	Journals and Peer reviewed Conference
Language	English
Availability	Articles available online as full text
Research discipline	Engineering, Business, Science, Economics, Social Science excluding medical, population statistics, digital storage trust, embedded systems, marketing smart city, nursing, pharmacology, neuroscience, chemistry and dentistry
Publication type	Peer- reviewed academic journal and conference papers