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Just over 31% of home purchases in December were made in cash.
Second biggest decline in investor interest since 2008.
A homebuyer on a $2,500 monthly budget can once again afford a $400,000 home.
Redfin report also shows year-over-year improvement.
Bidding wars have returned in some markets, but there's still a long way to go.
Affordability kept overall numbers of homebuyers down in the quarter, Redfin says.
