incidence of cancers diagnosed in the U.S. probably reflects more intensive screening programs, which diagnose more people with cancer. But, as stated above, its far from clear that diagnosing small prostate cancers based on PSA screening causes more good than harm. Most elderly men with prostate cancer do not die of that disease, but of heart disease or some other illness. (It is likely that some breast and lung cancers that are diagnosed through screening would also never come to light without screening.) In the U.S., these men with small, non-lethal cancers appear in the denominator of the O'Neill's calculation of cancer mortality rates, but not the numerator. In Canada, they appear in neither the numerator nor denominator. Thus, their estimate of cancer mortality rates is biased against Canada because of the higher screening rate in the U.S. 6-Income-based health disparities are, if anything, steeper in Canada than in the U.S. The O'Neills admit that health differences between those above and below the median income are sharper in the U.S. than in Canada. In fact, the differences between the top and bottom 10% are also bigger in the U.S., as are those between the top and bottom 25% etc. But the O'Neills want to measure health inequities on a new scale. They observe that the rich in the U.S. are much richer than the rich in Canada, and the poor are much poorer. Rather than comparing high and low income persons, they decide to analyze how much worse health gets