Across all 100 metros, less affordable markets tend to have high price gains. The correlation between the year-over-year price gain and the mortgage-payment-versus-wage measure is 0.3 (statistically significant at the 5% level). That means that homeownership affordability is becoming more unequal across the U.S. — the gap between more affordable and less affordable markets is growing. To see what this growing gap means for the housing market, read the full blog post by Trulia.