How the seed of greed is planted in children

Yesterday, I saw Amir my newphew's homework. The title of one of his readings was "Needs and Wants." He had answered one of the questions incorrectly. The question was, "What did you learn in paragraph 4?" It was a multiple-choice question. Amir chose, "Life is hard without a phone." 

But the correct answer was: "Wants can make life easier and more fun."
Implicitly what it says is that your personal desires (wants) are a legitimate pathway to happiness and an easy life.

This is the textbook example of cultivating a culture of greed. It is deliberate conditioning of children towards perpetual wanting. The entire edifice of capitalism is built on this very foundation: to become an endless consumer, fulfilling desires. 

Now, think about it. a 10-year-old boy, who understands very little about wanting and having, implicitly being told/taught that happiness and enjoyment are synonymous with possessions. This is how the seeds of greed are planted. How can I explain this to a refugee child that material possessions do not bring happiness and do not make life easier? How can I explain that contentment is the source of happiness and generosity makes life easier, and that materialistic values are ephemeral and sources of unhappiness? 

Welcome to the world of capitalism and greed.