Proximity Analysis shows your closest competitors or where their store locations are compared to your store locations. This tells you how many competitors fall within X miles of your store. You can also run this report to list the number of closest stores to your locations.
This report can be run for any two point layers in your map. This report provides the closest ZIP Code centroids to your center point.
You must have two point layers, but they don't have to be a store or customer layer.