This is a proportional symbol map. Unlike a graduated symbol map, this one shows exact values and not relative. ArcGis makes adjusting the size of the minimum and maximum values very easy and even displays the size of each before you change the setting. There are many adjustments that ArcGis allows you to make on these types of maps, but I am still not to the level where I know everything yet. With some practice and maybe some light reading I might be able to figure out the vast unknown which is ArcGis.
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