U.S. stocks are little changed at the open on Monday after a big drop on Friday. Investors are keeping a close eye on Geopolitical tensions. And, it's a busy week for earnings and economic data. But it may be news on the deals front that gives the markets direction in today's trading. Dollar Tree (DLTR) is buying rival discount retailer Family Dollar (FDO). The cash-and-stock deal is valued at about $8.5 billion. Also in deals news, the online real estate listings site Zillow (ZO) is buying rival Trulia (TRLA) for $3.5 billion in stock. Virgin America, partly owned by Richard Branson, filed for an initial public offering on Monday. Herbalife (HFL) is set to report Q2 earnings after the close. TheStreet's Susannah Lee reports from Wall Street.