The pie-chart given below shows the annual global market share of Pepsi and Coke for the last five years on average. Under what market structure do Pepsi and Coke operate? What microeconomic model can best describe the behavior of Pepsi and Coke? Explain the main theme of this model. Given the obvious market share of both Pepsi and Coke, on what grounds would you justify the multi- billion-dollar annual advertising spending by those two companies? Others, 4.2% Pepsi, 46.2% Coke, 49.6%