Economist: Technology now changes so rapidly that workers need periodic retraining. Such retraining can be efficient only if it allows individual companies to meet their own shortterm needs. Hence, large governmental job retraining programs are no longer a viable option in the effort to retrain workers efficiently. Which one of the following is an assumption required by the economist's argument? ['No single type of retraining program is most efficient at retraining technological workers.', 'Large governmental job retraining programs do not meet the short-term needs of individual companies.', 'Technological workers are more likely now than in the past to move in order to find work for which they are already trained.', 'Large job retraining programs will be less efficient than smaller programs if the pace of technological change slows.']