anchor: In fact, although it costs only about $100 a year to have a Lojack, Ayres and Levitt estimate that each individual Lojack prevents about $1,500 a year in losses due to theft.
positive: The Lojack is estimated by Ayres and Levitt to save $1,500 each year in losses to theft.
negative: The costs of a Lojack outweigh the yearly loss preventions estimated by Ayres and Levitt.