问一道题：NO.PZ201612170100000103

3. Using the financiresults for 2012 shown in Exhibit 2, it woulmost appropriate for Larsteto conclu theconomies of scale for firms in the home improvements retail sector: not exist. exist anare realizein cost of goo solonly. exist anare realizein both cost of goo solanSG& 3.Retail, Inc., operating margin 2012  1,480/15,091=9.8% Miize, Inc., operating margin 2012      598/8,488=7.0% Retail,Inc.,is a bigger firm anha larger operating margin, suggesting theconomies of scale are more likely to exist. Retailer COGS a %of Revenue 2012      9,966/15091=66%    Miize COGS a %of Revenue 2012      5,857/8,488=69% Retailer SG&A a %of Revenue 2012     3,654/15,091=24% Miize SG&A a%of Revenue 2012      2,033/8,488=24% Analysis of the expense ratios shows ththe economies of scale are realizein COGS rather thin SG&这道题为啥不从不同年份公司自己的数据进行对比呢？

3. Using the financiresults for 2012 shown in Exhibit 2, it woulmost appropriate for Larsteto conclu theconomies of scale for firms in the home improvements retail sector: not exist. exist anare realizein cost of goo solonly. exist anare realizein both cost of goo solanSG& 3.Retail, Inc., operating margin 2012  1,480/15,091=9.8% Miize, Inc., operating margin 2012      598/8,488=7.0% Retail,Inc.,is a bigger firm anha larger operating margin, suggesting theconomies of scale are more likely to exist. Retailer COGS a %of Revenue 2012      9,966/15091=66%    Miize COGS a %of Revenue 2012      5,857/8,488=69% Retailer SG&A a %of Revenue 2012     3,654/15,091=24% Miize SG&A a%of Revenue 2012      2,033/8,488=24% Analysis of the expense ratios shows ththe economies of scale are realizein COGS rather thin SG&答案这里好像显示的有问题 能具体写一下是怎么得出还有为什么C不对呢

没看懂答案，规模经济应该是随着sales增长，gross margin或者operating margin也增长吧？为什么答案是在对比两家公司COGS和SG A的sales占比

3. Using the financiresults for 2012 shown in Exhibit 2, it woulmost appropriate for Larsteto conclu theconomies of scale for firms in the home improvements retail sector: not exist. exist anare realizein cost of goo solonly. exist anare realizein both cost of goo solanSG& 3.Retail, Inc., operating margin 2012  1,480/15,091=9.8% Miize, Inc., operating margin 2012      598/8,488=7.0% Retail,Inc.,is a bigger firm anha larger operating margin, suggesting theconomies of scale are more likely to exist. Retailer COGS a %of Revenue 2012      9,966/15091=66%    Miize COGS a %of Revenue 2012      5,857/8,488=69% Retailer SG&A a %of Revenue 2012     3,654/15,091=24% Miize SG&A a%of Revenue 2012      2,033/8,488=24% Analysis of the expense ratios shows ththe economies of scale are realizein COGS rather thin SG&答案是不是有问题，都没有显示出来。