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On the other hand, mortgage securitization undid "the connection between borrowers and lenders", such that mortgage originators no longer had a direct incentive to make sure the borrower could pay the loan. While historically in the US, fewer than 2% of people lost their homes to foreclosure; rates were far higher during the Subprime mortgage crisis. Delinquencies, defaults, and decreased real estate values could make CDOs difficult to evaluate. This happened to BNP Paribas in August, 2007, causing the central banks to intervene with liquidity.