I suspect you get paid like someone who lives in Chile too. The average monthly income in Chile is less than half the average monthly income in the USA. I suspect a person working for Entel gets paid a fraction of what someone working for T-Mobile gets. In fact the minimum wage is roughly 5x higher in the USA.
Supply and demand does actually work both ways. It's a economic student's fantasy that it is a corporate race to the bottom for your dollar. In the end a balance is struck between forgoing more customers and sustaining high revenue. When you have a supply of wealthy people willing to pay for something, you charge for it.
At least that explains about half the price difference, the USA has some peculiarities that push the prices slightly higher.