How to make their workers more productive ? Variety isn¡¯t 16____________ for increasing productivity. Other experts fell that giving the worker freedom to do his job 17__________ is important. 18 __________ is how each worker contributes to the product he is making. To what extent does money lead to greater productivity ? They want more money because the work is boring. Money just lets them enjoy their 19_________ more. A similar argument si shorter 20____________.