The S&P 500 Index cratered 6.2 percent last year, the worst yearly close since the 2008 financial crisis. Will the weak economy be a key theme in 2019? We ask Tony Nash to weigh in on this, Apple's lowered forecast and more.

<p>The S&amp;P 500 Index cratered 6.2 percent last year, the worst yearly close since the 2008 financial crisis. Will the weak economy be a key theme in 2019? We ask Tony Nash to weigh in on this, Apple's lowered forecast and more.</p>

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