add blurb about marketareas

whosonfirst · Sep 28, 2018 · 4c91f8b · 4c91f8b
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diff --git a/README.md b/README.md
@@ -239,6 +239,8 @@ Marine areas are considered `common_optional`.
 
 `1360666019`
 
+Economic geography areas that are usually an aggregation of counties or postalcodes based on TV, radio, and other media related audiences.
+
 Market areas are considered `optional`.
 
 ### metroarea