Click to view a price quote on BRK.A. : It's the biggest conundrum gripping the economics profession right now, stoking befuddlement from Federal Reserve Chairman Jerome Powell to the billionaire investor and Berkshire Hathaway (BRK.A - Get Report) CEO Warren Buffett. Even as President Donald Trump's late-2017 tax cuts have stimulated U.S. economic growth and pushed the nation's unemployment rate to a half-century low of 3.6%, consumer prices have barely accelerated. Barclays, the U.K. investment bank, predicts that the jobless rate is likely to track even lower in the months ahead.