"If I were to ask you where the money in your savings deposit account is, you might say at the bank. That is not quite right. In truth, your money is in several places simultaneously. In this sense, finance is like quantum mechanics. Money is like Schrodinger’s cat – you never know where it is until you actually observe it. (And if everyone tries to observe their money at the same time, that’s called a bank run.)" - StatGuy, viết về vấn đề discount rate mismatch và fractional reserve banking, một bài rất đáng đọc, đặc biệt đoạn quote Jack Nicholson.