Question 8 (1 point) Which of the following statements is an example of a positive economic statement? O Governments should apply taxes to all carbon polluting industries, to shift carbon emissions to a societally optimal level. The economic benefits derived from the oilsands in Alberta do not outweigh the environmental costs, so the oilsands should be shut down When allocating natural resources across time, future generations should be left no worse off than the current generation. When doing a present value calculation, increasing the discount rate will result in a lower present value.Question 3 (1 point) In class we discussed two key indicators that are used in the selection of discount rates for present value calculations. One indicator is the 'social rate of time preference', which is the measure of a society's willingness to pay to postpone private consumption. Another is the 'social opportunity cost of capital', which is the marginal earning rate for private business investment. Which one of the following statements is true? O The 'social rate of time preference' should be constant across regions or countries. The 'social rate of time preference' is the upper bound estimate of the social discount rate. The 'social opportunity cost of capital' is the upper bound estimate of the social discount rate. The 'social opportunity cost of capital' represents the personal saving account rate