While home prices have increased 12% year-over-year in 2013, the fastest rate since 2006, prices remain below the peak levels seen during the housing bubble and are still undervalued compared to historic norms. Mortgage rates remain low but access to credit has tightened significantly compared to the bubble years, with average borrower credit scores much higher now. Some experts are concerned about the rise in home flipping but others note that investors are putting more of their own money at risk this time rather than relying on easy credit. Overall most data suggests that while the housing recovery is gaining momentum, conditions do not yet point to a new bubble forming across the market.