A funny thing often occurs after a mania-fueled asset bubble pops: an echo-bubble inflates a few years later, as monetary authorities and all the institutions that depend on rising asset valuations go all-in to reflate the crushed asset class.
Take a quick look at the Case-Shiller Home Price Index charts for San Francisco, Seattle, and Portland, OR. Each now exceeds its previous Housing Bubble #1 peak
Is an asset bubble merely in the eye of the beholder? This is what the multitudes of monetary authorities (central banks, realty industry analysts, etc.) are claiming: there's no bubble here, just a "normal market" in action.
This self-serving justification–a bubble isn't a bubble because we need soaring asset prices–ignores the tell-tale characteristics of bubbles. Even a cursory glance at these charts reveals various characteristics of bubbles: a steep, sustained lift-off, a defined peak, a sharp decline that retraces much or all of the bubble's rise, and a symmetrical duration of the time needed to inflate and deflate the bubble extremes.
It seems housing bubbles take about 5 to 6 years to reach their bubble peaks, and about half that time to retrace much or all of the gains.