When different supervisors define levels of performance (good, fair, poor) differently, unfair appraisals could result due to a problem with > ?

The answer is unclear standards. This graphic rating scale appears to be objective, but would perhaps effect in unfair appraisals since the traits and degrees of excellence are vague. For instance, different supervisors would probably define good performance as different while fair performance would be treated unalike too and so on differently. The same is true of traits such as quality of work or originality.

the answer is b, encourage free trade

the consumer demand because the members have to be aware if people are going to buy what they want to sell in this case either energy drinks or a car wash.