The latest shortage wreaking havoc on the country? Land. Developers are increasingly struggling to find suitable land for residential developments, the Wall Street Journal reported. Land-use restrictions such as zoning and infrastructure issues are among the challenges making it difficult to find sites near major metropolitan areas. With scarcity comes inflated prices. Morris Davis, a professor of finance at Rutgers Business School, pegs national residential land to cumulatively be worth more than $20 trillion. Davis