Mexico City, Mexico - After decades of depending on inflows of foreign capital to develop its economy, Mexico turned a corner and become a net exporter of direct investment capital in 2012, according to a report released this week.

Mexico's central bank said that Mexican corporations invested about $25.6 billion last year in buying up foreign plants and companies, more than twice the $12.6 billion foreigners invested directly in Mexican firms. An official confirmed that was the first time in recent memory that outflows exceeded inflows.

For a country that still has one foot planted firmly in the developing world, that news worried some analysts and delighted others.

"Mexico is in no position to become a net exporter of capital," said economist Ernesto Piedras of Mexico City-based Competitive Intelligence Unit. "Financing capital is a scarce resource in Mexico. We are still a country with a strong need for capital, for investment in highways, dams, and in telecommunications networks," said Piedras. "It's regrettable that we have more money going out than coming in."

The turnaround was due in part due to a steep drop in foreign investment in Mexico, from $21.5 billion in 2011 to $12.6 billion, accentuated by the decision by a Spanish bank to sell off about $4.1 billion in shares in its Mexican operations.

But the numbers also show that Mexican firms more than doubled the amount they invested in buying assets abroad, up from $12.1 billion in 2011.

Mexico's Carlos Slim - World's Richest Man

Part of the increase was due to big purchases of European telecom and foreign oil assets by Mexican magnate Carlos Slim, considered the world's richest man.

In 2012, Slim's companies announced deals to purchase an 8.4 percent stake in Argentina's state-controlled oil and gas producer, YPF S.A., about a quarter of Austrian phone carrier Telekom Austria AG, and a $3.4 billion deal for a 28 percent stake in Dutch carrier Royal KPN NV.

That kind of off-shore investment is no cause for mourning, said Mexico City economist Ramiro Tovar. "These big companies ... shouldn't be satanized for taking capital abroad. This should be seen as a sign of the growth of Mexican companies," said Tovar. "This is a positive sign."

"Mexico, like any other country, has a right to have multinationals," Tovar said, noting that if the trend continues, Mexico could start getting more income from dividend, profit, and royalty payments from abroad as a result of the investments.

Few, however, think the trend will become permanent. The foreign buying spree by Mexican magnates is unlikely to keep up at this pace, and foreigners, who are currently favoring portfolio investments in Mexican stocks and bonds, may return to sending more direct investment into Mexican factories and building projects.

That would be for the better, Piedras says.

"Just look around at the infrastructure we have, the quality of services and telecom coverage we have," he said. "We are in no position to share excess capital with the rest of the world, because we don't have it."