You perform a travel cost study that looks at the relationship between the cost of visiting a lake (including costs of travel, value of time spent not working & any entry fees), its water quality (measured by the concentration of fecal coliform bacteria) and the actual numbers of visitors. Circle the categories of values (willingness-to-pay) that this method can potentially uncover for individuals (there may be more than one).
a. Changes in recreational use value related to planned improvements in water quality
b. Reductions in consumer welfare from increasing the entrance fee
c. Benefits to homeowners that never use the lake but enjoy views of the lake and have increased property values due to their proximity to the lake
d. Changes in the non-use value of the lake as its perceived quality changes