diff --git a/.buildlibrary b/.buildlibrary
index 0723e242..6cddade4 100644
--- a/.buildlibrary
+++ b/.buildlibrary
@@ -1,4 +1,4 @@
-ValidationKey: '56333200'
+ValidationKey: '56356579'
 AcceptedWarnings:
 - Invalid URL: .*
 - 'Warning: package ''.*'' was built under R version'
diff --git a/CITATION.cff b/CITATION.cff
index 2bbd9381..9166a081 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -2,8 +2,8 @@ cff-version: 1.2.0
 message: If you use this software, please cite it using the metadata from this file.
 type: software
 title: 'mrremind: MadRat REMIND Input Data Package'
-version: 0.272.8
-date-released: '2026-07-16'
+version: 0.272.9
+date-released: '2026-07-17'
 abstract: The mrremind packages contains data preprocessing for the REMIND model.
 authors:
 - family-names: Baumstark
diff --git a/DESCRIPTION b/DESCRIPTION
index de4aa1cb..5e7529a0 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,8 +1,8 @@
 Type: Package
 Package: mrremind
 Title: MadRat REMIND Input Data Package
-Version: 0.272.8
-Date: 2026-07-16
+Version: 0.272.9
+Date: 2026-07-17
 Authors@R: c(
     person("Lavinia", "Baumstark", , "lavinia@pik-potsdam.de", role = c("aut", "cre")),
     person("Renato", "Rodrigues", role = "aut"),
diff --git a/R/calcRatioPPP2MER.R b/R/calcRatioPPP2MER.R
index 8d8f37c0..4c1fbd40 100644
--- a/R/calcRatioPPP2MER.R
+++ b/R/calcRatioPPP2MER.R
@@ -6,6 +6,8 @@
 #'
 #' Missing conversion factors are set to 1 and regional aggregation is weighed by GDP from WDI-MI-James.
 #'
+#' This ratio is also reported as the Price Level Index (GDP) in the World Bank's WDI database, which is equal to our
+#' measure multiplied by 100.
 #'
 #' @param year An integer specifying the base year of conversion factor. Defaults to the base year of
 #' [mrdrivers::toolGetUnitDollar()], currently: `r mrdrivers::toolGetUnitDollar(returnOnlyBase = TRUE)`.
@@ -17,9 +19,12 @@
 #'
 calcRatioPPP2MER <- function(year = as.numeric(mrdrivers::toolGetUnitDollar(returnOnlyBase = TRUE))) {
 
-  data <- readSource("WDI", "PA.NUS.PPPC.RF")[, year, ]
-  # Replace 0s with 1s. This was done previously. Other solutions here should be taken into consideration.
-  data[data == 0] <- 1
+  # Converting 1s returns the conversion factors. Missing conversion factors are set to 1.
+  data <- GDPuc::toolConvertGDP(gdp = new.magpie(getISOlist(), fill = 1),
+                                unit_in = glue::glue("constant {year} Int$PPP"),
+                                unit_out = glue::glue("constant {year} US$MER"),
+                                replace_NAs = "no_conversion")
+
   # Set names and years to NULL, for GAMS interface to work.
   getNames(data) <- NULL
   getYears(data) <- NULL
diff --git a/README.md b/README.md
index 7eba9af8..575d0f9d 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # MadRat REMIND Input Data Package
 
-R package **mrremind**, version **0.272.8**
+R package **mrremind**, version **0.272.9**
 
    [![R build status](https://github.com/pik-piam/mrremind/workflows/check/badge.svg)](https://github.com/pik-piam/mrremind/actions) [![codecov](https://codecov.io/gh/pik-piam/mrremind/branch/master/graph/badge.svg)](https://app.codecov.io/gh/pik-piam/mrremind) [![r-universe](https://pik-piam.r-universe.dev/badges/mrremind)](https://pik-piam.r-universe.dev/builds)
 
@@ -39,7 +39,7 @@ In case of questions / problems please contact Lavinia Baumstark <lavinia@pik-po
 
 To cite package **mrremind** in publications use:
 
-Baumstark L, Rodrigues R, Levesque A, Oeser J, Bertram C, Mouratiadou I, Malik A, Schreyer F, Soergel B, Rottoli M, Mishra A, Dirnaichner A, Pehl M, Giannousakis A, Klein D, Strefler J, Feldhaus L, Brecha R, Rauner S, Dietrich J, Bi S, Benke F, Weigmann P, Richters O, Hasse R, Fuchs S, Mandaroux R, Koch J, Abrahao G, Dorndorf T (2026). "mrremind: MadRat REMIND Input Data Package." Version: 0.272.8, <https://github.com/pik-piam/mrremind>.
+Baumstark L, Rodrigues R, Levesque A, Oeser J, Bertram C, Mouratiadou I, Malik A, Schreyer F, Soergel B, Rottoli M, Mishra A, Dirnaichner A, Pehl M, Giannousakis A, Klein D, Strefler J, Feldhaus L, Brecha R, Rauner S, Dietrich J, Bi S, Benke F, Weigmann P, Richters O, Hasse R, Fuchs S, Mandaroux R, Koch J, Abrahao G, Dorndorf T (2026). "mrremind: MadRat REMIND Input Data Package." Version: 0.272.9, <https://github.com/pik-piam/mrremind>.
 
 A BibTeX entry for LaTeX users is
 
@@ -47,9 +47,9 @@ A BibTeX entry for LaTeX users is
 @Misc{,
   title = {mrremind: MadRat REMIND Input Data Package},
   author = {Lavinia Baumstark and Renato Rodrigues and Antoine Levesque and Julian Oeser and Christoph Bertram and Ioanna Mouratiadou and Aman Malik and Felix Schreyer and Bjoern Soergel and Marianna Rottoli and Abhijeet Mishra and Alois Dirnaichner and Michaja Pehl and Anastasis Giannousakis and David Klein and Jessica Strefler and Lukas Feldhaus and Regina Brecha and Sebastian Rauner and Jan Philipp Dietrich and Stephen Bi and Falk Benke and Pascal Weigmann and Oliver Richters and Robin Hasse and Sophie Fuchs and Rahel Mandaroux and Johannes Koch and Gabriel Abrahao and Tabea Dorndorf},
-  date = {2026-07-16},
+  date = {2026-07-17},
   year = {2026},
   url = {https://github.com/pik-piam/mrremind},
-  note = {Version: 0.272.8},
+  note = {Version: 0.272.9},
 }
 ```
diff --git a/man/calcRatioPPP2MER.Rd b/man/calcRatioPPP2MER.Rd
index 35c67e93..86b0f272 100644
--- a/man/calcRatioPPP2MER.Rd
+++ b/man/calcRatioPPP2MER.Rd
@@ -24,6 +24,9 @@ with base year equal to the \code{year} argument) from PPP to MER. So for exampl
 }
 \details{
 Missing conversion factors are set to 1 and regional aggregation is weighed by GDP from WDI-MI-James.
+
+This ratio is also reported as the Price Level Index (GDP) in the World Bank's WDI database, which is equal to our
+measure multiplied by 100.
 }
 \examples{
 \dontrun{