27 Question 9 1 points Save Answer Which of the following statements is true? Markets for the external costs and benefits created by externalities exist but are hard to identify. . Property rights are well defined as long as market transactions between economic agents occur in a competitive environment. A key characteristic of all externalities is that there are costs and/or benefits to economic activity that are accounted for in the price of the activity. Property rights are the rights to control the use of a good or eated by externalities exist but are hard to identify