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Public Goods: Demand Curve and Optimal Quantity definitions

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  • Private Good
    A product characterized by rivalry and excludability, where consumption by one reduces availability for others.
  • Public Good
    A product that is non-rival and non-excludable, allowing simultaneous use by multiple individuals without exclusion.
  • Market Demand
    The total value society places on a good, found by aggregating individual preferences at each relevant point.
  • Horizontal Addition
    A method for constructing demand curves for private goods by summing individual quantities at each price.
  • Vertical Addition
    A method for constructing demand curves for public goods by summing individual prices at each quantity.
  • Marginal Social Benefit
    The combined value all individuals assign to an additional unit of a public good at a specific quantity.
  • Marginal Social Cost
    The expense to society for providing one more unit of a public good, typically represented by the supply curve.
  • Supply Curve
    A graphical representation of the cost to provide various quantities of a good, used to determine optimal provision.
  • Optimal Quantity
    The amount of a public good where the total societal benefit equals the total societal cost.
  • Non-Rivalry
    A property where one person's use of a good does not diminish its availability to others.
  • Non-Excludability
    A property where it is impossible to prevent others from accessing a good once it is provided.
  • Individual Demand
    The value a single consumer places on different quantities of a good, forming the basis for market demand.
  • Externality
    A side effect impacting third parties, not reflected in supply or demand unless specifically accounted for.
  • Willingness to Pay
    The maximum price an individual assigns to a specific quantity of a good, used in constructing demand curves.
  • Security Guard Example
    An illustration of public goods where two businesses share protection, demonstrating vertical addition of demand.