Global Value Chain Decomposition of Inter-Country Input-Output Tables R package icio version 1.0.0 Four global value chain (GVC) decompositions of gross exports from inter-country input-output tables are implemented. The Leontief decomposition derives the value added origin of exports by country and industry, as in Hummels, Ishii and Yi (2001) <doi:10.1016/S0022-1996(00)00093-3>. The Koopman, Wang and Wei (2014) <doi:10.1257/aer.104.2.459> decomposition splits country-level exports into 9 value added components, and the Wang, Wei and Zhu (2013) <doi:10.3386/w19677> decomposition splits bilateral exports into 16 value added components. The Borin and Mancini (2019) <doi:10.1596/1813-9450-8804> decomposition splits country-, sector- or bilateral-level exports into up to 13 value added and GVC components, and also provides a corrected version of the (biased) Koopman-Wang-Wei decomposition. It is the recommended method and reproduces the 'icio' command for 'Stata' described in Belotti, Borin and Mancini (2021) <doi:10.1177/1536867X211045573>. Software Depends: R (>= 3.5.0) Imports: data.table, matrixStats Suggests: testthat, knitr, rmarkdown Sebastian Krantz <sebastian.krantz@graduateinstitute.ch> Comprehensive R Archive Network (CRAN) Sebastian Krantz [aut, cre] (ORCID: <https://orcid.org/0000-0001-6212-5229>), Bastiaan Quast [aut] (ORCID: <https://orcid.org/0000-0002-2951-3577>), Fei Wang [aut], Victor Stolzenburg [aut], Oliver Reiter [ctb] GPL-3 2026-09-07 application/tgz https://CRAN.R-project.org/package=icio doi:10.32614/CRAN.package.icio