### Rice on a chessboard

A courtier presented the Persian king with a beautiful, hand-made chessboard. The king asked what he would like in return for his gift and the courtier surprised the king by asking for one grain of rice on the first square, two grains on the second, four grains on the third etc. The king readily agreed and asked for the rice to be brought. All went well at first, but the requirement for 2^{n}^{ – 1} grains on the nth square demanded over a million grains on the 21st square, more than a million million on the 41st and there simply was not enough rice in the whole world for the final squares. (From Meadows et al. 1972, p.29 via Porritt 2005)

**Second Half of the Chessboard** is a phrase, coined by Ray Kurzweil, in reference to the point where an exponentially growing factor begins to have a significant economic impact on an organization’s overall business strategy.

The total number of grains of rice on the **first half** of the chessboard is 1 + 2 + 4 + 8 + 16 + 32 + 64 + 128 + 256 + 512 + 1024 … + 2,147,483,648, for a total of exactly 2^{32} − 1 = 4,294,967,295 grains of rice, or about 100,000 kg of rice, with the mass of one grain of rice being roughly 25 mg.

The total number of grains of rice on the **second half** of the chessboard is 2^{32} + 2^{33} + 2^{34} … + 2^{63}, for a total of 2^{64} − 2^{32} grains of rice. This is about 460 billion tonnes, or 6 times the entire weight of the Earth biomass.

On the 64th square of the chessboard there would be exactly 2^{63} = 9,223,372,036,854,775,808 grains of rice. In total, on the entire chessboard there would be exactly 2^{64} − 1 = 18,446,744,073,709,551,615 grains of rice.

The Chessboard story, which is mind boggling, is to simply illustrate the **power of** **compounding**…… no wonder it is dubbed as “**The 8th Wonder of the World”**. Now that we understand how powerful compounding is, lets us look for ways to make use of this principle to multiply whatever money we have…………..if you are saying you don’t have, relook at your expenses, get out of debts and start saving now, no matter how small to start with. Put your plan into ACTION.

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