Well not being familiar with Tesco, are they only a FOOD store? Walmart does both Retail and Food, so it would seem that on the FOOD only I think they're saying that Tesco is larger but on overall Company wealth/size and ranking Walmart is much larger.
Rank Company Country Industry Sales ($bil) Profits ($bil) Assets ($bil) Market Value ($bil)
16 Wal-Mart Stores United States Retailing 378.80 12.73 163.38 198.60
116 Tesco United Kingdom Food Markets 83.61 3.71 48.58 62.41
