Developers of neighborhood Y are trying to lure potential homebuyers by offering a large discount on newly built homes  As a result, the homes in neighborhood Y are available for 20% less than comparably sized homes in neighborhood X
So unless potential homebuyers distrust the developers of neighborhood Y, neighborhood X is unlikely to attract many homebuyers because there are plenty of houses available in neighborhood Y
There are fewer houses for sale in neighborhood X than there are in neighborhood Y.