... Choice 4 39 Dateqsugar 199 2q1 199 5q3 199 9q1 2002q3 2006q12,0002,2002,4002,6002,800DatePsugar2224262830 199 2q1 199 5q3 199 9q1 2002q3 2006q1(a)(b)Figure 9. 1. Quantity and retail ... 82 .9 1 29 1560.4 75.2 89. 8 150 1710.5 90 .2 99 .4 180 192 0.6 112.8 113.8 2262240.7 150.4137.8 3012760.8 225.6186.0 4513820 .9 451.2330.4 90 2 699 0 .99 4,512.42 ,92 9.0 9, 0256,405Source: ... 199 6).17See Topkis ( 199 8) and, in particular, the results due to Vives ( 199 0) and Zhou ( 199 4).18Industrial economists are by no means unique in such an approach since the same potential for multiplicity...