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This R&D covers wage growth in the U.S. economy.  Although the U.S. economy is improving, wage growth for Americans has lagged behind, with hourly wages rising 0.5% last month.  Economists are optimistic that significant wage growth could take place in 2015, as businesses such as Wal-Mart have recently decided to raise the pay of its workers to $10 an hour.  If wage growth takes off, it could compel the Federal Reserve to raise interest rates in order to temper inflation in the economy.  Creating better wage growth is also a rallying call for those who seek to reduce income inequality in the United States.