Our financial bubble, like all bubbles, has many complex strands feeding into it — called derivatives and credit-default swaps — but at heart, it is really very simple. We got away from the basics — from the fundamentals of prudent lending and borrowing, where the lender and borrower maintain some kind of personal responsibility for, and personal interest in, whether the person receiving the money can actually pay it back. Instead, we fell into what some people call YBG IBG lending: “you’ll be gone and I’ll be gone” before the bill comes due.