Global business confidence has cooled down last month as a result of the euro zone debt crisis. But the investors are still optimistic about the economy of the United States. This is according to a survey made by financial information firm Markit. Majority of the companies surveyed expect business activity to increase over the next 12 months. They outnumber those who anticipate a decline by 37 percent. The difference is down from 44 percent in February, when Markit last did a similar survey of 11,000...