By Casey Hall SHANGHAI (Reuters) -China's leaders have pledged to put an end to aggressive price cuts by some Chinese companies which regulators say are spurring excessive competition that is damaging the economy. The so-called "anti-involution" campaign has been sparked by overcapacity among Chinese manufacturers - a legacy of past government efforts to stimulate the economy - and price cuts made to clear stock or spur consumption. Those cuts have prompted price wars across various sectors that are rais ...