We not only know placebos “work,” we know there is a hierarchy of effectiveness:

• Placebo surgery works better than placebo injections
• Placebo injections work better than placebo pills
• Sham acupuncture treatment works better than a placebo pill
• Capsules work better than tablets
• Big pills work better than small
• The more doses a day, the better
• The more expensive, the better
• The color of the pill makes a difference
• Telling the patient, “This will relieve your pain” works better than saying “This might help.”