Incomplete comparison

Name of fallacy Incomplete comparison
Type Inductive Argument, Informal Argument
Description Where not enough information is provided to make a complete comparison
Example An advertiser might say "product X is better". This is an incomplete assertion, so can't be refuted. A complete assertion, such as "product X sells for a lower price than product Y" or "the new product X lasts longer than the old product X" could be tested and possibly refuted.
Treatment Dealt with by showing that the comparison cannot be tested and is therefore useless. If an advertisement say "product X is better" it cannot be tested because the assertion does not say what makes product X better.