Answer:Trade Can Make Everyone Better Off
Explanation:This is a fifth principle by Mankiw in which he suggest that there are competition amongst families for jobs and also even when shopping we are in competition for best prices. However if this were to stop we would have to rely on our own produced food from our gardens and make our own clothes and shelters. Trade has given us an opportunity to do what we are best at , the one who is good in farming focuses on that , the one who is good at sewing does it the best and so does the one who is good at building.
This trade is crucial to support the huge number of human population on earth which wouldn't be supported by only relying on everyone producing their own stuff , he believes we would have enough land to farm and feed ourselves .