[IceMetalPunk]

The placebo effect has control over a person's own perceptions and, to a much lesser degree, their own health. It can make them feel happier or less pain, it can even bolster the immune system by reducing stress, but it won't cure cancer. It also will not manifest money, or turn you into a cat or a banana, or do anything supernatural. It cannot manifest anything beyond a person's own perceptions and mild health benefits.

Whether something is true or not is absolutely relevant. To quote Tim Minchin's brilliant poem "Storm": is truth "so loose-weave of a morn / When deciding to leave your flat by the door / Or the open window on the second floor?"