Where are the world's next economic powerhouses?
Jim O'Neill, the noted economist who coined the term BRIC for the emerging markets of Brazil, Russia, India and China, is eyeing investment opportunities in other regions.
Enter MINT: Mexico, Indonesia, Nigeria and Turkey.
O'Neill, who worked at Goldman Sachs from 1995 until April 2013, recently traveled to all four countries. Though bullish on all four markets, he told "Street Signs" he feels "most warm about" Mexico and Nigeria.
"Mexico is probably the most competitive producing nation in terms of low-valued-added stuff like autos," said O'Neill, pointing out that the North American country has made a rash of policy changes that have boosted commerce.
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While O'Neill acknowledged that Nigeria has "enormous challenges and problems" and is a "very complex country," he thinks it harbors "immense opportunities."
Indonesia, on the other hand, left him the "most cold."
Though its advantage is not entirely clear, even to him, O'Neil said the South Pacific nation benefits from a fast-growing and relatively young population, with a burgeoning middle class.
—By CNBC's Drew Sandholm. Follow him on Twitter @DrewSandholm.