Out of the candidates "1369 bucks " and "$ 685" for the price attribute, "1369 bucks" is chosen as it contains more known attribute values (Canon, 2.8D, lens) in its context in review 1.
as "$ 685" has many competing attribute values (which do not match the known values) in its context (Nikon, AF, f/3.5-5.6G), it is rejected.