Cities with high charter school enrollment have consistently improved achievement for low-income students, a new report from center-left think tank the Progressive Policy Institute found. Contrary to choice-skeptical talking points, charter schools breed innovation and push local public schools to improve as well, according to the report. “The data analyzed in this study are conclusive: All 10 U.S. cities with 33% or higher enrollment in public charter and charter-like schools…uniformly narrowed gaps in academic outcomes between low-income students and all students statewide over the past deca…