A company mines 330,000 tons of coal per year in a rural county. The coal is worth $ 75 per ton. The average price for a 2,000-square-foot house with three bedrooms more than 20 km away from the mining site in this country is $ 220,000. The average price for a similar, 2,000-square-foot house with three bedrooms within 4 km of the mine is 4 percent lower.
Using comparative statics, what is the effect of mining on home prices in this county?
Mining changes the price of a 2,000-square-foot home (with three bedrooms) by $ negative (_______)