The situation for all four countries represented clearly shows a positive relation
between income and a modern ICT infrastructure (data for the UK is missing due to
insufficient data supply by the World Bank).
The most interesting insight gained is that the relation between income and ICT
infrastructure is most pronounced in those countries with a lower overall income as well
as a less developed infrastructure. Nevertheless, the apparent correlation might also work in
the other direction, namely that a high income leads to higher investments in ICT and
therefore a better ICT infrastructure. To clarify this issue one will need more data and it also
will be interesting to learn from on-going World Bank projects. It also might be helpful to
apply causality tests to the data to get statistical evidence on the direction of causality; the
ITU database offers a rich set of ICT data that could be exploited in the future.