A companymines 360,000 tons of coal per year in a rural county. The coal is worth $71 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 county is $250,000. The average price for a similar, 2,000 square foot house with three bedrooms within 4 km of the mine is 6 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 $?