Earnings Preview: V, ALL, DWA, WFM

More earnings from a busy day on Wall Street:

Visa Inc. (NYSE:V) is expected to announce earnings of $1.50 a share when it reports results after the market closes this afternoon. The company's revenues are expected to rise to $2.48 billion for the three months. In the same period in 2011 the company earned $1.46 per share and brought in revenues of $2.25 billion. Investors will be watching the results closely after the firm's main competitor, Mastercard, announced its earnings this morning. Their statement showed increased market share at the expense of Visa. An improved credit situation in the United States, as...