There have been some studies, notably, regarding the divergence of per capita GDP across provinces over time. We did that in our reports—I think the 2020 report—and looked at the convergence of per capita GDP across provinces. In that report we found that over the last 10 to 12 years, there seems to have been a trend towards convergence of per capita GDP across provinces.
GDP is one measure through which we can measure whether economic disparities persist or are getting smaller over time.