What affect does the proximity of the valley of ashes to the wealthy east and west eggs have on the reader?

The location of the Valley of Ashes is a result of the social and moral decay of the wealthy. The actions of both the newly rich and those born to wealth has had a direct affect of the long stretch of land that divides the West Egg from the city. Because of its proximity, the Valley reminds the reader that there are consequences to EVERY action.