What exactly does Phoenix, AZ produce?

When I was little, and studied Geography, we had to memorize all kinds of (what we then thought) were useless facts.

What was the chief cash crop of Thailand? What were the largest exports from Russia? What was the biggest industry in Australia?


So, what exactly does Phoenix, AZ contribute to US GDP? (sixth largest city and all!)

Population: 1,461,575

Houses for Sale: 53,350

So, 3.65% of Phoenix wants to sell their houses?

Do you see the problem?