NEW YORK--(BUSINESS WIRE)--Wells Fargo Investment Institute (WFII) today released the 2015 Midyear Outlook report “Opportunities in an Improving Global Economy,” offering investors a view of a steadily improving economy in the second half of the year. The report offers a guide to help investors take full advantage of opportunities and position themselves for the potential of higher stock market returns for the rest of the year. “We believe investors will see increased market volatility througho