Urban Infrastructure Investments and Economic Growth: Examining the Impact of Transportation, Utilities, and Broadband Expansion in the United States

Abstract

This study examines Urban Infrastructure Investments and Economic Growth, considering the role of transportation, utilities, and broadband expansion in urban economic performance in the United States from 1980 to 2022. The paper draws on historical data from the U.S. Bureau of Economic Analysis and the Congressional Budget Office. The study employs correlation analysis, Principal Component Analysis (PCA), and a Vector Autoregressive (VAR) model to capture both linear associations and dynamic interdependencies among variables. The results indicate that transportation infrastructure investment, which averaged 2.3% of GDP annually during the study period, has the strongest positive correlation (r = 0.78) with urban economic growth. Broadband investment, although rising significantly only after 2000, demonstrates a growing impact with a correlation of r = 0.63. Energy infrastructure also shows a positive but more modest association (r = 0.58). The PCA reveals that transportation accounts for 42% of the total variance in infrastructure-related economic growth factors, followed by broadband (31%) and energy (27%). The VAR model confirms a significant lagged effect, with infrastructure investments exerting their most pronounced impact on GDP growth after 3 to 5 years. Unit root tests (ADF and PP) show all-time series variables are stationary at first difference. This supports the validity of the time series framework. These findings emphasize the important role of coordinated and sustained investment in transportation, digital infrastructure, and utilities to support inclusive and resilient urban economic development. Policy implications, therefore, include prioritizing multimodal transportation systems, expanding broadband access in underserved regions, and modernizing energy grids to meet future demand.