The previous chapters documented and formally analyzed a variety of channels, both old and new, through which public capital may affect growth. Various extensions, mostly technical in nature, were outlined at the end of some chapters. This chapter sets out a broader research agenda on the links among public capital, growth, and human welfare. It considers the following areas: heterogeneous infrastructure assets, the political economy of government spending allocation, excludable public goods, interactions between government debt and public capital accumulation in the presence of fiscal rules, spatial and regional dimensions of public capital, infrastructure and trade, public–private partnerships, the impact of public capital on income distribution, negative externalities associated with public capital, and empirical tests of the impact of public capital on growth.
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