The graph below shows a production function and the subsistence level of output.a)does the production function exhibit encreasing or decreasing marginal prductivity?b)label a level of population at which the population is expected to grow. What is the surplus output at that population level?c)label a level of population at which the population is expected to decline. Why is the population dexlining at this point?d)label the population at which the economy is in long-run equilibrium. Why is the a long-run equilibrium?GRAPH(output) on the left, (labor) underneith X and Y axis then from the corner of that right angle axis a 45 degree straight line (subsistence level of output) then at that same corner point of the right angle a arch like a rainbow (production function) goes through the 45 degree (