ECON 103 Lecture Notes - Lecture 18: Sunk Costs, Marginal Product, Diminishing Returns

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The firm makes a lot of decisions to get it"s main objective maximize profit. Some decisions are critical to the survival of the firm. Some decisions are irreversible, or extremely costly to reverse. Other decisions are easily reversed and less critical to the survival of the firm, but still influence profit. All decisions can be placed into two time frames: short run. A time frame where the quantity of one or more resources used in production is fixed. For firms, the capital aka firm"s plant is fixed in the short run. Other resources used by the firm (like raw materials, energy, labour, etc) can be changed in the short run. A time frame where the quantities of all resources including plant can be varied. A sunk cost is the cost used by the firm that can"t be changed. Example: a firm"s plant that has no resale value. Sunk costs are irrelevant to a firm"s current decisions.

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