@inbook {Amaral, title = {Market competition, public good, and state interference}, booktitle = {Public-private dynamics in higher education. Expectations, developments and outcomes}, year = {2007}, pages = {89-110}, publisher = {Transcript Verlag}, organization = {Transcript Verlag}, address = {Bielefeld}, doi = {10.14361/9783839407523-004}, url = {https://doi.org/10.14361\%2F9783839407523-004}, author = {Alberto Amaral and Ant{\'o}nio Magalh{\~a}es}, editor = {J. Enders and B. Jongbloed} }