Canada has a median income that is only 6% lower than the US. Describing it as "quite a lot poorer" is plainly nonsense. GDPPC is a mean, and can be skewed by

Canada has a median income that is only 6% lower than the US. Describing it as "quite a lot poorer" is plainly nonsense. GDPPC is a mean, and can be skewed by a smaller percentage of the population earning an very high salary. (The fact that the US has a higher Gini index (41.4% vs 33.3% for Canada) suggests that this is what's going on.) It does not tell you how "poor" or otherwise a typical inhabitant of the country is.