The company has for several yeas followed a policy aimed at decrasing operation cost and improving the efficiency of its distribution system.

请问: policy和aime的逻辑关系应该是主动的，为什么这里aim用了ed形式而不是aiming呢?

同时，有一个选项是with the aim to decrease operating cost and to improve, 为什么不能选?..

merci~

here "aimed" is used as adj.  if you use "aiming", like in E

"with the aim...", it can either refer to the policy or the

company.