RT Journal Article T1 New England’s Pinnacle: fostering quality entrepreneurial ecosystems A1 Almeida, Alejandro A1 Golpe Moya, Antonio Aníbal A1 Martín Álvarez, Juan Manuel A1 Vides González, José Carlos AB This paper has assessed the dynamics of entrepreneurial ecosystems across the USstates. To do this, we have used the Startup Formation Rate (SFR) and the EntrepreneurialQuality Index (EQI) from a novel data set called the Startup CartographyProject, which spans from 1988 to 2014. For this purpose, we have applied thePhillips and Sul (Econometrica 75:1771–1855, 2007, Econometrics 24:1153–1185,2009)’s club clustering algorithm in order to identify the existence of absolute orregional convergence. Our results suggest the existence of two and three clubs convergence,respectively. More importantly, when attending EQI, California and Massachusettsform a club, which is evidence of the importance of quality entrepreneurshipover quantity. Furthermore, from a geographical point of view, SFR clubs showa scattered distribution throughout the national territory, while the EQI clubs aremore homogeneous. In this sense, we apply the Local Moran I test to the EQI clubthat is formed by California and Massachusetts to analyze the possible spillovereffects of these states, to their neighbours. Finally, this gives valuable informationfor designing entrepreneur policies at different levels PB Springer SN 1309-4297 SN 2147-4281 (electrónico) YR 2025 FD 2025-02 LK https://hdl.handle.net/10272/25489 UL https://hdl.handle.net/10272/25489 LA eng NO Almeida, A., Golpe, A. A., Martín-Álvarez, J. M., & Vides, J. C. (2025). New England’s Pinnacle: fostering quality entrepreneurial ecosystems. In Eurasian Business Review (Vol. 15, Issue 1, pp. 243–271). Springer Science and Business Media LLC. https://doi.org/10.1007/s40821-025-00296-9 NO Funding for open access publishing: Universidad de Huelva/CBUA DS Repositorio Institucional de la Universidad de Huelva RD 29 may 2026