The change in equilibrium shown in the accompanying figure would be explained by an) _______in the price of an input and an) _______ in the price of a_______ . 
Definitions:
Volunteers
Individuals who freely offer to take part in an activity or to perform a service.
Participants
Individuals who take part in a study or research project.
Registered
Officially recorded and recognized by authorities or organizations.
Attack Rate
is the percentage of an at-risk population that contracts a disease during a specified time period, often used in the context of an outbreak.
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