The Return of the Housing Bubble???????

Okay, it's not like the good old days of 2002–2007, but there are some grounds for concern in certain markets. In particular, the Case-Shiller tiered price indexes are showing extraordinary increases in the bottom tier (lowest third of house sale prices) in several markets.

For example, the index shows that in Denver prices in the bottom tier have risen by 16.7 percent over the last year and by 49.8 percent over the last three years. The comparable figures for the top tier are 6.4 percent and...