Question 4 (Sales and Woolworths dominate the Australian grocery retail (AER hereafter} sector. Which type of market structure does this sector resemble? Based on the concepts learnt in this unit explain the likely reasons for the prevalence of this type of market structure in the AER sector. Is the dominance of tales and Woolworths in the AER sector strength or a weakness for the Australian economy? Explain using relevant examples. {500 words. 10 marks)