Entire post lifted from European Tribune
…Analogies are never perfect, but here’s one using horse racing. Don’t expect a perfect correspondence to the banking situation, but I think it is close enough for government work.

Joe goes to the track and bets $2 on a horse.

Two guys standing nearby get into a discussion and Fred says to Sam, “I’ll bet you $5 that Joe wins his bet.”

Next to them are Bill and Bob. Bill says: “I’ll bet you $10 that Fred welshes on his bet if he loses.”

Next to them is Sally. Sally says: “For $3 I’ll guarantee to Bill that if Bob fails to pay off, I’ll make good on the bet.”

Sally then goes to Mary and borrows the $7 needed in case she has to ever pay off and promises to pay back $8. She doesn’t expect to every have to pay since she believes Bob will always make good. So she expects to net $2 no matter what happens to Joe.

A quick calculation indicates that there is now 2+5+10+3+7 = $27 riding on the outcome of the horse race.

Question how much has been “invested” in the horse race?

Answer: here.