English: See the United States housing bubble and subprime mortgage crisis for in-depth discussion and citations. A brief summary of each vertical "string" of causes is included below. While there are many factors that influenced the housing bubble, fundamentally a bubble is built one transaction at a time. Risky lending decisions were made by institutions and risky borrowing decisions were made by both individuals and institutions. According to the Pew Research Center, “There is a broad public consensus regarding the causes of the current problems with financial institutions and markets: 79 percent say people taking on too much debt has contributed a lot to the crisis, while 72 percent say the same about banks making risky loans.”