Mark Ritson: Only crap marketers mistake stereotypes for segments: If%20your%20segment%20is%20populated%20by%20different%20people%20who%20want%20different%20things%2C%20it%20is%20not%20a%20segment.%20It%u2019s%20a%20joke%20and%20so%20are%20your%20skills%20as%20a%20marketer.
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