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I have too many tales to tell about these kinds of issues.When I was working in a store, as a seller and cashier, I had to be very polite, but unfortunatelly people were not. That freaked me out!
They not even say hello or good morning. When people go to buy, forget that the workers are people too, and they need to be treated as people, not as machines or slaves. Please! You only have to say hello and your day and other´s day are going to be better.
Solution:
Media should show by posters on the city walls, in the subway, in the buses, T V spots, etc. How to be more polite with the people who you live with. I mean a publicitary campaign.
Meanwhile , I will say hello ever to all the people, wherever I go. Do it!