Assume D1 represents the current demand curve for skis.Which of the following would most likely cause D1 to shift to D2? 
Definitions:
Double-blind Study
A study design in which neither the participants nor the researchers know which participants belong to the control group and which belong to the experimental group until the conclusion of the research.
Experimental Drug
A pharmaceutical compound that is in the process of being tested for effectiveness and safety in treating a particular disease or condition but has not yet received governmental approval for general use.
Placebo
A substance with no therapeutic effect, used as a control in testing new drugs.
Control Group
In experimental research, this is the group of participants not exposed to the experimental treatment, serving as a baseline to compare with the experimental or treatment group.
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