However, much will depend on implementation, and stimulating effective co-operation will require DRG payments and the recent specific small-hospital payment scheme to be modified. Additional independent econometric research using hospital-level data would also help identify best practices and potential efficiency gains. The retail price indices (national definition) include reimbursements by the statutory insurance schemes. Drees (2016), Les depenses de sante en 2015 - Resultats des comptes de la sant&, Comite economique des produits de sante (2015), Rapport d'activite du CEPS 2015. However, the financing of expensive treatments has not prevented the sustained increase in volume of use (Panel B).