Refining raw gold ore to remove impurities and concentrate gold content usually involves caustic chemicals. One method involves dissolving the gold with a concentrated cyanide solution. The concentrations of cyanide used in this process are extremely dangerous, and if spilled into the environment, pose a significant threat to wildlife and human health.

A city has hire you to a CBA for a Gold mine and processing facility bound to be to installed between the county limits. They promise to keep any cyanide solution in safe storage and dispose of it without any risk to the local population. Nevertheless, the city council wishes for you to analyze the possible impact of a spillover of the pollutant.

You have gather all the relevant information that would allow you to carry out your analysis except for one, the shadow price for a kilogram of spilled cyanide solution. You don't have a proper budget to calculate this variable, luckily your research team has found four other analysis that computed the cyanide's shadow price. You make a list of similarities and differences between those analysis' cities and your city of interest:

shadow price % of farming land("farm") Proximity closest city (pm-gag") Population of closest city ("pop") study A 100 5% 200km 50k B 400 80% 100km 10k 500 30% 150km 800k D 3000 70% 50km 300k city of interest 50% 150km 700k