What is Non-Unique in debate?

Calling an argument non-unique means its impact doesn’t depend on the resolution. The harm (or benefit) happens in both worlds, so it can’t be a reason to prefer either one. For example, against "the policy causes debt," a non-unique response shows debt rising on its current trajectory anyway. Non-uniques are defense, since they zero out an argument instead of flipping it, but they are fast, need little evidence, and are devastating against cases built on trends that are already underway.