Rabbi said:
A house is worth what someone is willing to pay for it. So there is no over valuing or undervaluing.
... interest rates and no collateral, etc
loans have a bit to do with housing prices.
Prices reflect willingness ("demand") and ability ("demand with money") to pay. Low interest rates make credit cheap. People borrow more than they otherwise would, and bid up the prices, as more money (augmented by borrowing) chases fewer products (houses). And, when rising prices can actually fuel further demand-with-borrowed-money, due to
speculation, then a "self-fulfilling cycle" occurs, wherein rising prices attract more buyers, inflating prices,
etc.
Eventually, prices inflate to the point, where everybody recognizes that the products (houses) cannot possibly be worth what sellers are asking. Then prices plummet, as everybody tries to sell, to earn back what money they can, to pay back the banks. Over-valuing can occur, when speculation occurs, as the demand-with-money ("demand") for the product (house) no longer represents demand purely for that product; but also
speculative demand, due to past price history (rising prices):
bubble price = (demand for house) + (demand for speculative profit)
corrected price = (demand for house)
Easy credit, fueling
speculation, inflates prices
beyond "normal" market forces. Speculative psychology can dominate rational market forces. When "irrational exuberance" develops, dominated market forces no longer reflect real product prices.
Pres. Obama was not yet President (2008), when easy credit fueled speculation, on US housing markets (2006). Arguably, Pres. Obama can only be judged, on how he handled the crisis, which he inherited. Arguably, government deficit spending has failed to "stimulate" economic recovery. Arguably,
more-of-the-same government deficit spending would
continue to fail to "cure" the economy.
Past successes (highways, internet) are
non-relevant, to
present circumstances (unless they be good guides, for brainstorming "the
next internet" Public program).