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Public investment can enhance productivity and promote economic growth, foster societal wellbeing, and support long-term policies. Government expenditures can be considered investments if they are directed towards durable assets like transport and energy infrastructure, healthcare and education facilities, IT systems, defence systems, and intangible assets such as research and development. Government investment often includes purchases needed to implement long-term policies, such as promoting sustainable development by investing in green energy infrastructure.

Across OECD countries, government investment spending averaged 3.4% of GDP in 2021, ranging from 6.6% of GDP (and 6.9% in 2022) in Hungary to 1.7% in Mexico. Investment rose in 22 of 38countries between 2019 and 2021, with an overall average increase across all OECD countries of 0.1p.p of GDP. The largest increases were in Greece (1.2p.p.), Portugal (0.9p.p.), Slovenia (0.8p.p.) and Iceland (0.7 p.p.). In 2022, across the OECD-EUcountries investment amounted to 3.3% of GDP. In 9 of thesecountries plus Canada, public investment rose between 2021 and 2022. The largest increase relative to GDP was in Slovenia (0.7p.p.) (Figure‎11.14). Government investment represented 15% of total investment on average across OECD countries in 2021 (Online FigureG.6.8).

Investment spending as a share of total government spending provides a measure of the relative importance of capital formation in overall expenditures. It averaged 7.4% of total spending in 2021, down from 8.1% in 2019. Israel and Colombia experienced the largest decreases in investment as share of total spending over this period (3.5 p.p. and 2.8 p.p. respectively). However, this share increased between 2021 and 2022 in 22 out of the 26countries with data for both years. The largest rises were in Slovenia (2.4p.p.), Canada (1.5 p.p.), Austria (1.4 p.p.) and Ireland and the Slovak Republic (both 1.0 p.p.) (Figure‎11.15).

The distribution of investment expenditure across levels of government varies considerably, especially between federal and unitary countries. In 2021, on average across OECD countries, 42.6% of government investment was carried out by central government, while 28.5% was conducted by state and 28.3% by local governments. In 23 out of 37OECD countries, central government accounted for over half of government investment. Typically, government investment in non-federal countries is predominantly carried out by central government, as in Chile (88.6%), Türkiye (86.9%), Hungary (79.8%) and theUnitedKingdom (71.2%). In highly decentralised or federal countries, it is primarily carried out by state and, to a lesser extent, local governments. For example in Canada the shares are 4.9% central, 54.1% state and 41.0% local government; in Belgium 23.5%, 51.8% and 24.1%; and in Mexico 29.4%, 39.4% and 28.2%. Between 2021 and 2022, central government’s share of investment expenditure grew in 17 of the 26OECD countries with available data (Figure‎11.16).