Asian markets rallied early Monday, even as the takeover of Fannie Mae and Freddie Mac reinforced concerns about the U.S. economy and its reliance on foreign investors.

In “Hot, Flat, and Crowded,” Thomas L. Friedman embraces going green not just as a national security imperative but also as an economic El Dorado.

Wall Street managed a slight gain on Friday, a day after concerns about the economy, and in particular the labor market, sent the Dow plunging. Markets in Europe and Asia ended the day lower.

Wall Street declined further in early trading after a worse-than-expected unemployment report. Earlier, markets in Europe and Asia slid, following the Dow’s steep fall the previous day.

Stock markets plunged in Asia, continuing a downturn that began in Europe and deepened on Wall Street.

Stock markets plunged in Asia, continuing a downturn that began in Europe and deepened on Wall Street.

Stock markets plunged in Asia, continuing a downturn that began in Europe and deepened on Wall Street.

For oil producers that have grown accustomed to rising revenues, falling oil prices are turning into a cause for concern, if not quite panic.

Stocks fell around the world Monday, led by Asian exchanges as concerns about a slowing global economy weighed on the markets.

Russia will ban imports from 19 producers in the United States and warned that an additional 29 suppliers face a possible ban on health and safety grounds.