Jonathan Miller created this pretty amazing graphic for our sister site, Curbed. It summarizes every single Manhattan real estate transaction that was finalized between 2006 and 2014 in one enormous chart. On the horizontal axis is the year, while the sale price is on the vertical axis:
He says it's striking proof that the sale of a $100 million condo is an extreme outlier. I say the gobsmackingly large number of dots above the $50 million line shows that we really are living through a second gilded age. But it's Miller's chart and Miller's data so go read his analysis.