HONG KONG managers should receive constant retraining in management skills so they can stay competitive, a management academic says. Management Charter Initiative chief executive Professor Tom Cannon told the opening ceremony of a management development symposium that Hong kong managers should learn how to manage the dilemma presented by the business paradox of customers wanting better services for lower prices. 'Managers have to learn how to manage the paradox and make everyone in the business continuously seeking to learn,' he said yesterday. 'The biggest source of competitive advantage in the world today is the quality of management - the ability of managers to manage change, to innovate and to develop. 'And the main determinant of quality management is the training development they undertake.' Prof Cannon said managers should heed global trends towards further education, given the number of multi-national enterprises in Hong Kong. He said the privatisation experience in Britain was a good model for Hong Kong businessmen in China. 'With the opening of China, there is large scale of movement out of the public dominance into privatisation,' he said. A main board director of Marks & Spencer, David Sieff, told the symposium that businessmen wishing to succeed amid intense business competition had to develop quality management. 'Those who are not capitalised for change will be overtaken by their rivals.'