A customer that can afford it may willingly overpay for a product due to brand affinity/prestige. Even otherwise, there are 8 billion people on the planet. Getting $10 profit from 100 million people means a billion dollars in profit. None of the 100 million people need to have been poor or exploited; small profits per person can result in a billionaire simply due to the large human population. This is not to say that all current billionaires obtained all their wealth through such innocent means – many have used violence or state assistance – just that it is possible.
