Funding and unequal opportunity: Charter funding is also negatively affecting regular public schools. Charter advocates rely on the premise that as money flows from a regular school to a charter school, the costs of the regular school go down proportionately. Sounds good; it's just not true. Costs in schools sending students to charters cannot shift as fast as students and revenue leave. The costs for the principal, heating, lights, building debt and many other things remain; thus, the remaining children face the prospect of larger class sizes and cuts to core academic programming, music, art and other inequities. Opportunity for the 13,000 charter school students in Baltimore City is in part funded by the loss of opportunity for the remaining 70,000 students without a commensurate performance improvement by charter school students.