It’s a parched, scorching desert out there for many U.S. home buyers. For the past 28 months, the housing market has been defined not just by demand—which remains sky-high in many parts of the nation—but also by the shrinking number of available homes for sale. So what are the signposts of a tighter-than-tight marketplace? Buyers are jumping on realtor.com® listings within seconds of their initial postings. Wanna-be homeowners are burrowing themselves into ever-scarcer, ever-busier open houses and going a little mad trying to get in the first bid. Real estate agents are knocking on hundreds of doors just to squeeze out one more listing.