A useful article for A Level Economics relating to Factors that influence aggregate supply…
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Edexcel spec reference 2.3.2/3 – Factors that influence aggregate supply
AQA spec reference 18.104.22.168 – The factors which affect long-run AS and distinguish them from those which affect short-run AS.
OCR spec reference Page 20 – Explain why the aggregate supply curve may shift in both the short run and the long run.