From the viewpoint of society, monopoly leads to effects that are less desirable than (that) resulting from economic competition.

여기서 that이 틀렸는데요

뭘로 고쳐야 맞는건가요?

the effects라고 고쳐도 말은 될것 같은데

출제의도가 그게 아닌것 같아서요;; 뭘로 고쳐야할까요? 출제 의도에 맞춰;;