2015 is widely regarded as a promising year for the global economy.Indeed, news are spreading that the world economy is bouncing back, hopefully to pre-crisis levels.But job cutting by many of the world's top companies has put this into question.It has been reported that 115 of the world's Top 500 companies are cutting jobs in large numbers this year.For instance, HP will slash jobs by up to 30,000, IBM by 118,000 and Deutsche Bank by 230,000.So why are large companies still cutting jobs amid nascent economic recovery?What can experts tell us about the science behind downsizing?