RJ Hottovy breaks down the takeaways from this week’s retail earnings. He says Walmart’s (WMT) success in the discretionary categories is “really meaningful” when compared to Target’s (TGT) struggle in the same field. He adds that data shows customers are narrowing their focus: Walmart shoppers aren’t going anywhere else. He also compares Walmart and Best Buy’s (BBY) performances in electronics, a holiday shopping driver.