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Summary A Level Economics Theme 3: Costs.

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I personally spent hours condensing textbooks, past papers, and videos into a clear, concise, and exam-focused format so you don't have to. These notes explain the topic of Costs in Theme 3 of Edexcel A Level Economics, covering fixed costs, variable costs, total costs, average costs, and marginal costs. Clear diagrams and worked examples are included to show cost curves and their relevance to firms’ production decisions. Perfect for exam revision, these notes help you understand cost structures and their importance in microeconomics.

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Uploaded on
September 2, 2025
Number of pages
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Written in
2025/2026
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Summary

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Costs - theme 3.​

Short run - at least one factor of production is fixed.
Long run - all factors of production are variable.




Short run:


-​Because there is at least one FOP that is fixed, the
others could be variable.
-​Therefore, in the short run there are fixed costs and
variable costs.


Variable costs.


-​ They vary with output, e.g. raw materials,
ingredients, wages.


Fixed costs.


-​Don't vary with output e.g. capital, space, salaries
-​ (salaries are paid annually hence why they are fixed.
Wages are paid in accordance to how many hours are
worked hence why they are variable)



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