This article does not explain the mechanism at work. How are Federally guaranteed, privately originated loans functionally different from Federally guaranteed,

This article does not explain the mechanism at work. How are Federally guaranteed, privately originated loans functionally different from Federally guaranteed, publicly originated loans in terms of education cost inflation? They could only be different if the principal determining mechanism is also different between the programs but that is not mentioned. Private grade school costs have also grown 42% in real dollars over the last ten years.* Federal loans do not explain this fact either. *https://www.nais.org/articles/documents/member/tuitiontrends_final.pdf https://www.nais.org/articles/documents/member/tuitiontrends...