BECAUSE IT WAS NO NEED TO HAVE SLAVES. IF YOU HAD SLAVES YOU WERE JUST PLAIN OUT LAZY.
With war, every country is afraid. They're afraid of possibly being ambushed, becoming in dept, and many other reasons. So by remaining neutral they can sit back and not have to worry about being attacked by any country that's fighting. But that's not always the case now and days. Hope I answered your question correctly.
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An example of an incentive program a government may use to stimulate the economy is providing tax "breaks" for companies that hire certain types of workers, or to companies that invest in more sustainable infrastructure.