What is Yield curve? What does it show about the economic conditions?
What is Yield curve? What does it show about the economic conditions?

Yield is one of the most common terms used in finance and economics. Technically, yield is explained as the annual percentage return earned on a security (like bond). In a pure financial literature sense, yield is the rate of return we are getting from a security. For example, a 6% yield means that the investment averages 6% return each year (an example for return is interest rate).

Yield applies to returns from various types of securities including shares, bonds, bills and insurance products. But it is mostly and more specifically used to describe the return on bonds and debentures.

Yield are different types – coupon yield, yield to maturity etc. But here, our objective is to understand how the yield that generally prevailing in an economy explains the present economic conditions. Hence we consider coupon yield or the return (interest rate) offered on a security (bond) by the issuing entity to the person who purchases the security.

Here we consider the yield of the most important security – Government Bonds, indicate about the prevailing economic situation in the country.

What is Yield Curve? How a normal yield curve looks?

          The yield curve shows the relation between the (level of) interest rate (or cost of borrowing) and the time to  maturity. How the rate of return (say measured in terms of interest rate) changes with time (say, years) of investment.

  • Investing for a period of time t gives a yield Y(t).
  • This shows that yield is related with time or is a function of time.  

          This function Y is called the yield curve, and it is often, but not always, an increasing function of t.

Higher yield shows that higher interest rate should be given for borrowing. Usually, higher yield is offered for a security to attract investors to make investment overtaking risk.

Normal yield curve

Yield curves are usually upward sloping; the longer the maturity, the higher will be the yield (interest rate offered). Higher the period for which you invest in a security, higher will be the yield (or rate of interest).

But for increasing number of years, the increase in yield (interest rate) will be small. This means that the curve flattens out for higher maturity.   

A normal yield curve shows normal economic conditions generally. But at the same time, higher yield or rate of interest indicate that cost of borrowing is higher. 

Importance of government bond and its yield in understanding economic situations

On which type of securities we can observe the trend in yield curve for a country? Here comes the importance of government bonds. Government is a very creditworthy borrower and a big borrower as well. Hence the yield curve of government bonds is taken as standard mirror explanation about current economic conditions.

The upward sloping yield curve is the normal yield curve which shows you will get higher interest rate if you invest in a long term bond. This is a typical yield curve that is shown in the diagram attached here.

But yield curve need not be upward sloping always. There are exceptions.

The exceptions are flat yield curves and downward sloping yield curves as well.

Flat yield curve

In the case of a flat yield curve, there is no difference between short term interest rate and long term interest rates. Or in other words, interest rate will be the same if you invest for a short time or for a long time.

Inverted yield curve

If there is negative relationship between interest rate and maturity period of a bond, the yield curve will be negative sloping. This is called inverted yield curve. Here, you get higher interest rate for short term investment. This type of inverted yield curve shows that economy is in some sort of a crisis now. because of the bad economic conditions now, you will get higher interest rate to cover the risk you are facing. But in the long term, interest rate (yield) decreases, indicating that the economy will come back to normalcy in the long term.


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