Sean Gill, a research analyst at the University of Washington's Center on Reinventing Public Education, has written an opinion piece at The Seventy Four in which he raises the question of what kind of monopoly America's K-12 school system actually is. His conclusion: it's not the good kind.
Further, “breaking the monopoly” doesn’t mean that traditional district-run schools must completely wither away. School districts could better serve students by moving decision making over funds and strategies down from the central office to school leaders, while creating new high quality schools where they are needed. If district-run schools were de-coupled from specific attendance zones, parents would have even more choices.