Infrastructure investment (public finance)

Public expenditure on building, upgrading, or maintaining essential systems such as transport, energy, water, and communications networks. It creates or preserves assets that support economic activity and public services.

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Capital budgeting: The process of evaluating and selecting long-term investments, including public projects. Governments use it to compare infrastructure projects and allocate limited capital.
Transport infrastructure: Physical networks and facilities used to move people and goods. Roads, railways, ports, and transit systems are major destinations for public capital.
Public capital: The stock of durable assets owned or controlled by government and used to provide public services. Investment adds to this stock, while depreciation and neglect reduce it.
Public consumption: Government spending on goods and services used to meet current needs rather than create long-lived assets. It contrasts with investment spending that builds or preserves durable infrastructure.
Cost–benefit analysis: A method that compares a project's social benefits with its costs, often across time. It helps assess whether broad public gains justify an infrastructure project's expense.
Energy infrastructure: Facilities and networks that produce, transmit, store, and distribute energy. Public investment can expand energy access and strengthen system reliability.
Economic growth: An increase over time in the production of goods and services in an economy. Infrastructure can raise productivity by reducing transport, energy, and communication costs.
Privatization: The transfer of ownership or control of an enterprise or asset from government to private actors. It shifts infrastructure ownership or operation away from direct public provision.
Public-private partnership: A long-term arrangement in which government and private firms share responsibility for providing public infrastructure or services. It offers an alternative to financing and delivering projects solely through public agencies.
Water supply and sanitation: Systems that provide safe water and manage wastewater and human waste. These networks deliver essential services with large public-health benefits.