The placebo effect can have a negative influence also, a nocebo. If a placebo is given that the patient believes to be harmful to their health in some way, he or she may develop symptoms appropriate to this belief.
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it has a negative effect cause all things are negative no matter what this is a life answer trust me
A positive effect is one that is favorable; a negative effect is one that is unfavorable.
Most people would consider it having a negative effect
Not much...
-18. Subtracting a positive number has the same effect as adding a negative.