Citigroup researcher Mark Mahaney today estimated that Google may ship only a small number of Nexus One smartphones in 2010. The analyst expects as little as 1 million and as many as 3 million, and notes that it should have relatively little financial impact on the company, generating between $500 million and $1.6 billion. As Google is trying to stimulate sales by running low margins, each million units moved could actually cost it 1 percent of margin across the entire company.