CNBC's Diana Olick looks at a new report from Coldwell Banker Real Estate which ranks the nation's most and least expensive markets by looking at what a four-bed, two-bath household would cost in different areas.

For instance, such a home would run on average about $302,632 nationally. But in Newport Beach, Calif.--which Coldwell picked as the nation's most expensive market--that same home would run for $2.3 million. Meanwhile, in Cleveland, you can nab a four-bed, two-bath home for just $74,502.

Affordability is becoming more of a headwind, as the housing market continues through its slow recovery ...  

The nation's homebuilders have increasingly focused on higher-end, higher-priced homes, as that is where the bulk of buyer demand has been. As more young workers consider homebuying, however, that strategy may backfire. 

D.R. Horton ... reported better-than-forecast quarterly earnings Tuesday. Its average selling price of just under $289,000 is lower than most of its large competitors, and its Express Homes, entry-level brand ... with an average sale price of $191,000, shows renewed focus on affordability and a belief that this is the next segment of the market to recover.

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