(Figure: Profit-Maximizing Output Level I) What is TRUE about the slopes of the total revenue and total cost curves at the firm's profit-maximizing output level? What is the actual slope of the total revenue curve at the profit-maximizing output level? What is the firm's marginal cost at the profit-maximizing output level? 
Definitions:
Immunity
The ability of an organism to resist a particular infection or toxin by the action of specific antibodies or sensitized white blood cells.
Antigens
Substances often found on the surface of pathogens (like bacteria and viruses) that trigger an immune response when detected by the body.
Vaccination
The act of introducing a vaccine into the body to produce immunity to a specific disease.
Latent Infection
An infection that is present but does not exhibit symptoms until activated under certain conditions.
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