Public Goods: Public goods are non-excludable and non-rivalrous commodities provided by governments, such as public parks or national defense.
Investment: Investment refers to allocating resources into assets with an expectation of generating future income or profit. In the case of infrastructure development, it involves spending on long-term projects to enhance economic capabilities.
Multiplier Effect: The multiplier effect refers to the concept that an initial increase in spending results in a larger increase in overall economic activity. In the context of infrastructure development, it suggests that investments in infrastructure can have broader positive effects on employment and income levels.