※ 다음 글의 내용과 일치하지 않는 것을 고르시오. [문 19～문 20] New research suggests that when a home's value falls below 75 percent of the amount owed on the mortgage, the owner starts to think hard about walking away, even if he or she has the money to keep paying. The number of Americans who owed more than their homes were worth was virtually nil when the real estate collapse began in mid-2006, but by the third quarter of 2009, an estimated 4.5 million homeowners reached the critical threshold, with their home's value dropping below 75 percent of the mortgage balance. Walking away ― also called "jingle mail," because of the notion that homeowners just mail their keys to the bank, setting off foreclosure proceedings ― began in the Southwest during the 1980s oil collapse. ＊ foreclosure:저당물을 찾는 권리의 상실