{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Low-performing teachers have high costs.(commentary)(Raj Chetty, John Friedman, and Jonah Rock-off's research)(Critical essay): An article from: Education Next","author_name":"Eric A. Hanushek","thumbnail_url":"https://www.ebooknetworking.net/books/noimage.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B008J8A5Y6.html\">Low-performing teachers have high costs.(commentary)(Raj Chetty, John Friedman, and Jonah Rock-off&#039;s research)(Critical essay): An article from: Education Next</a>","width":400,"height":300}