What Is Compound Interest?

photo by Roman Oleinik

US News & World Report quoted in What Is Compound Interest? It opens,

When it comes to investing, compound interest really is the most powerful force in the universe. Remarkable in both its simplicity and its power, compound interest is the concept of reinvesting, along with the original principal sum, the interest earned on your investment.

As a result, you earn interest on top of interest, and then more on top of that larger sum, and so on. “Over time, a small amount of money can become a mountain of money,” says David Winters, CEO of Wintergreen Advisers.

Compound interest is one of the most basic concepts for investors to understand, in no small part because its magical results work the same whether you have $100 or $100 million.

In that sense, it’s every investor’s secret weapon – and you probably want to use your secret weapon if it can help you build your retirement nest egg (which it can). Unfortunately, if you look at how the average American spends and invests, it doesn’t reflect a great respect or understanding of compound interest.

It’s time to change that.

Proving its power in a thought experiment. David Reiss, professor of law at Brooklyn Law School, likes to convey the profound power of compound interest with a riddle of sorts.

“Would you rather receive a gift on Jan. 1 of $1 million, or a penny that doubles every day for the rest of the month?” Reiss says. “Most kids would go for the million bucks, but those who are patient enough to do the math know that they can get millions more if they are patient enough to wait the month.”

It’s true. The penny-doubler would in fact finish January with $9.7 million more than his or her instant gratification-seeking friend.

Reforming the Fed

Peter Conti-Brown and Simon Johnson posted their policy brief, Governing the Federal Reserve System after the Dodd-Frank Act, on SSRN (also on the Peterson Institute for International Economics website). I have said before that the Fed is a “riddle, wrapped in a mystery inside an enigma” and I stand by that characterization. This policy brief is very helpful, however, in identifying the legal structure of the Federal Reserve System as well as the practical constraints and political forces that affect the workings of that legal structure.

The authors write that by statute, the chair of the Fed

decides almost nothing herself: The Federal Reserve System is supervised by a Board of seven presidentially appointed, Senate-confirmed governors, of whom the chair is but one. In practice, the chair has frequently had a disproportionate influence on the monetary policy agenda and also the potential to predominate on regulatory matters—working closely with the Fed Board’s senior staff. Even so, for the most significant decisions, the Board must vote, and the chair must rely on the votes of the other six governors (for Board matters) and in addition, on a rotating basis, the votes of five of the twelve Reserve Bank presidents (for monetary policy). On regulation and supervision issues, the chair can do little of consequence without the support of at least three other governors. (1)

The brief goes on to document other aspects of the Fed’s organizational structure and the practical politics of Fed decisionmaking. For those of us who have a hard time parsing how the Fed acts, this is a useful document.

The brief also argues for a new approach to Fed governance:

The Fed chair is arguably the most important economic appointment any president makes. After the crises, new statute, and bold decisions of recent years, this job has become even more important.

During its first 100 years of existence, the position of Fed chair has risen to exercise great potential power. By statute, an appointee can remain in office 20 years or more. A perceived “maestro” effect in which insiders and outsiders are discouraged from challenging the chair is no longer a model with broad appeal, if it ever was.

The Board of Governors could provide an effective counterweight to the chair. Indeed, such a counterweight is what Congress intended by requiring presidential appointment and Senate confirmation of the entire Board. In order to break the tradition of a chair-dominated board, governors need sufficient expertise and experience to engage with and in some instances counteract the chair and Fed staff.

A president’s choice for Fed chair matters enormously, but the choice for members of the Board also matters a great deal. Monetary policy remains a crucial criterion but not at the exclusion of regulatory policy. The Board is second to none—in the nation and indeed arguably in the world—in its responsibility for regulatory oversight over the financial system. The president, members of the Senate, and the general public ignore these considerations at significant peril to the financial system and the economy. (9)

The brief presents a powerful alternative to business as usual at the Fed.  Hopefully, it will gain some traction.