https://www.nytimes.com/2020/02/19/upshot/rich-city-poor-city-population-growth.html
The analysis of the data is the story - the reporters looked at a dataset about wealth change over a period of time in different areas, and found a new angle by grouping the metropolitan areas by their wealth, instead of some other variable like location or another factor variable. This analysis was enriched a little by some visualisations that first paint a picture of change in wealth over time for the 5 richest cities, and then show in greater detail how the change looks for different areas within the top 250.