Say you live on an island without much technology. Everybody on the island farms manually, but everyone is still hungry because they can't grow enough. Then one

Say you live on an island without much technology. Everybody on the island farms manually, but everyone is still hungry because they can't grow enough. Then one day somebody invents a tractor. Now all of a sudden there is enough food for everyone to eat as much as they want. The island just got wealthier because technology increased their efficiency. This process is basically how the world gets wealthier, through increases in worker efficiency.