There is a need to rationalise customs duties particularly in those sectors which are growing at a healthy pace for the last several decades, an official said on Thursday. The official, however, said that providing a protection of high duty is required for the infant domestic industry. "But if the industry is 40-50 years old and has developed, has good competition, good investments and if they are globally known, then they should also be competing with the global firms," the official argued. Normally, customs duties or tariffs are used as a policy tool to ensure a higher level of protection for certain sectors to boost domestic manufacturing. These remarks assume significance as there is demand from countries which are negotiating free-trade agreements with India to cut down import duties in sectors such as auto and alcoholic beverages. Overall duties in certain segments are up to 150 per cent like alcoholic beverages. "There is a need for balancing in the duty structure. One cou