A good example here for discussion around the determinants for goods and services /supply and demand https://www.bbc.co.uk/news/business-46583424

See below where to find the relevant section in the spec:

Edexcel spec reference 1.2.2 Demand

AQA spec reference 4.1.3.1  The determinants of the demand for goods and services

OCR spec reference P7 Supply and demand and the interaction of markets