For each question, please clearly (i) identify the main concepts (ii) discuss and explain the theories (iii) give the evidence/graph/equation/ equality. Suppose a proposed new road to be constructed in between New City and Old City will lower the average cost per trip by car from $5 to $4. Currently, 500,000 trips are made between the two cities per year. An estimate indicates that, all other things being equal, the new road will increase the number of trips per year to 600,000. Calculate the annual benefits to motorists of the new road as based on their willingness to pay