Greed has existed for centuries. Nothing new here. Every other emotion, such as the desire for power, envy, hatred, etc., all blend together as a part of greed. But greed has always been the bottom line. Whether it's land or possession, greed has prompted many a person to seek that which doesn't belong to one...yet.
Like 'they' say: The man who dies with the most toys... still is dead.
I've known & have been friends with people from all economic backgrounds. There are Christians in all economic levels just as there are non-Christians in those same economic levels.