Time, and not timing, is the key to successful investment.

So who has the best chance of success?

Another approach is to disregard the risks of market timing and to ask how great the benefits would have been if an investor's timing had been right.

Let us take a hypothetical situation of 3 people who invested a fixed amount every year for 20 years.

• Person A is extremely lucky and annually invests at a market low, as determined by a particular Stock Market Share Index (JSE All Share Index). 
• Person B is unlucky and annually invests at a market high.
• Person C invests on a 'random' date every year, in this case 31st January.

The compound return earned by

• person A over the period is 14.0% a year,
• while in the case of person B it amounts to 11.3%. 
• person C achieved a return of 12.9% a year. 

(Dividend income was not taken into account in the research.)

It is

• not surprising that an investment at a market low achieved a better return than an investment at a market high, but
• the difference in return between the high and the low/'random' date is less than expected.

Although there are times when you should be more heavily invested,

• the risk of underperformance increases considerably if you are continually with-drawing from and returning to the market. 

Investors who buy and hold have the best chance of being successful.