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In the field of economics, the additional cost associated with one more unit of something is called a(n) :
Whooping Cough
A highly contagious bacterial infection of the respiratory system characterized by severe coughing spells that end in a 'whooping' sound.
Pertussis
A highly contagious bacterial infection of the respiratory tract, also known as whooping cough, characterized by severe coughing spells that can last for weeks.
Artificial Immunity
Immunity acquired through medical intervention, such as vaccination, as opposed to immunity gained through natural infection (natural immunity).
Immunizations
The process by which individuals are made immune or resistant to an infectious disease, typically by the administration of a vaccine.
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