Just want to point out that the abstract says the relationship is linear with log(income). And Fig 1 shows an x-axis range of 15,000-500,000; even if their conc

Just want to point out that the abstract says the relationship is linear with log(income). And Fig 1 shows an x-axis range of 15,000-500,000; even if their conclusions are true, I wouldn't be surprised if the relationship breaks down beyond those limits.