A version of this article appears in print on Feb. 21, 2010, Section BU, Page 7 of the National edition with the headline: In Practice, Stock Formulas Weren’t Perfect.

M = Overall market level For example, if a stock has a V = ₹10 and beta B = 1.5, when the market index is at 10,000, the stock price should be: Stock price = 10 + 1.5 * 10,000 = ₹15,010 ...

Baby formula shortages are forcing parents to make swift moves to keep their children fed. If the formula you’ve been using has run out of stock, switching to another brand can be a safe ...