Historical Stock Market Returns

Looking at averages can be misleading for fans of baseball and investing. Your batting average may be the best team in the league until they face the pitcher with the best average ERA (ERA). Investors who expect to receive the scholarship average annual return each year will be disappointed.

Many investors take it as truth that October is the worst month of the scene of the year. However, the research refers to the average monthly award of 1926 and it appears that September has always been the worst month, with an average return of -0.75%. Just like the best hitting team that is experiencing the best pitcher, in September 2009 ignores the middle and turned in a respectable 3.7%. You can not count on an average each time.

Speaking of the average, according to various reports of the stock market average annual return of about 8% over the 81 years ending in 2008. Many mutual funds and investment advisers, such as using average annual returns, because it allows them to use a larger number. Faced with this situation to ask is that the simple average or composite average. It makes a difference, to an average of about 7% and the most important thing we will discuss shortly. Many investment advisers use average stock market returns to convince their clients to invest with them in the market. The problem is not every year this issue back to average. A history lesson might be in order.

In the 83 years, the stock market lost money in 28 of those years. Worse, it has lost more than 20% in eight of those years and four different times of the market has fallen by one third during this year. Ouch.

When you look at the stock market average annual return, there are several important factors to understand. The first is the effect of dispersion around the average. The second is how the negative returns, ie the losses really hurt your back. The calculation of average annual returns do not take into account the effect of these two factors. The compound rate of return includes them the number reflects the return you should expect.

Dispersion around the mean

Upon her return in a series of numbers are more dispersed than average, the compound yield declines. The higher the volatility of returns, the greater the decline of compound. A few examples will demonstrate this phenomenon. The table below shows five examples of how the dispersion of returns affects the rate of compounds.

In each case, the simple average is 10%, while the average reduction consists of the dispersion of returns widens. In each of the last two years, the market losses experienced. Loss widens the dispersion of the declaration, which lowers the average compound.

Half the time the stock rises or falls 16% or more in one year. Consider the feedback we have seen in the market in recent years. They more accurately reflect years of positive returns and negative similar to examples 4 and 5.

Negative returns

Another consequence of losses on the market is that it takes a lot longer to get back to where you started. If you earn 10% the first year, then lose 10% the second year you still have a loss in two years as shown in the first instance. In addition, if you lose 50% in one year, you must generate a return of 100% to just break even. A proposal very difficult.

Therefore, the message must be very careful and not lose money. When you do, you must generate a better return to equilibrium, let alone make money. No wonder that the first rule of Warren Buffett investors.