The key is to remember the four reforms set out by the World Health Report 2008, which revived the agenda of primary health care under the banner "Now More Than Ever."
The report grouped its recommendations into four reform areas: universal coverage reforms to improve health equity and fairness, service delivery reforms to make care people-centred, leadership reforms to build more reliable and inclusive governance, and public policy reforms to promote and protect the health of communities.
Mapping the choices, social reforms align with the universal coverage and equity dimension, leadership reforms are listed directly, and policy reforms correspond to public policy reforms. Each of these three is part of the report.
Economic reforms, by contrast, are not among the four reform areas described in the report, which makes it the odd one out.
Therefore the reform not proposed in the World Health Report 2008 is economic reforms.
\[\boxed{\text{Economic reforms}}\]