While its competitors stumble in developing countries, emerging markets continue to be a source of strength for Unilever. The company said first quarter sales rose more than 6% in emerging markets, helping the world's No. 2 consumer product company offset declines attributed to currency fluctuation. Emerging markets grew 6.6%, with good contributions from both volume and price. In developed markets, North America had a slow start to the year whereas Europe held up well. Unilever saw continu...