What factors made the middle colony unique

They had fertile soil, so they were a major exporter of wheat and other grains. The lumber and shipbuilding industries were also successful because of the abundant forests, and Pennsylvania was decently successful in the textile and iron industries.

Explanation:

They had a lot going for them economically and didn't have to focus on one thing.

no , per capita income is not a true measure of the development because: -it only tells us about average income not how income is distributed among the people.it only give us an idea of the economic aspect.it is only at the qualitative basis.moreover, income is not only the way of development other factors are also as much as important as income.

the earthquake in haiti was a magnitude of 7.0 according to the u.s geological survey yet the smaller earthquake in haiti killed more than 200,000 and left more than 1.2 million people homeless. the chile earthquake was a magnitude of 8.8 and 500 times more stronger but chile's earthquake only injured 712 people.