Brexit: Technology-based customs system ‘could cost £20bn’

A useful link for A Level Economics relating to variable costs http://www.bbc.co.uk/news/uk-politics-44229606 and where to find the relevant section within the spec:

Edexcel spec reference 3.3.2 a) Formulae to calculate

  • o average variable cost

AQA spec reference 4.1.4.4 The difference between fixed and variable costs. 

OCR spec reference P10 Explain what is meant by: average variable cost (AVC)