In the graph below are total costs for countries that participate in an international treaty to reduce carbon emissions as functions of the number of countries that end up participating, N. There are N identical countries in total. Va is the climate damage plus abatement costs incurred by a country that participates in the treaty and abates its carbon emissions, and yna is the climate damage suffered by a country that does not join the treaty. Use this graph to answer questions (14) and (15). $ NC N N VRA va (14) What is the minimum number of countries that must participate with the treaty for the treaty participants to be at least as well off as if no treaty forms? Explain your answer. [3 points] (15) Explain why we should expect that a treaty will form in this case, but that it probably will not have all countries participating. [2 points)