Illustrates an example of Co-integration

Illustrates an example of Co-integration?

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Assume you have two stocks S1 and S2 and you get that S1 − 3 S2 is stationary; therefore this combination never strays more far from its mean. When one day it ‘spread’ is mainly large then you would have sound statistical reasons for thinking as spread might shortly decrease, giving you a possible source of statistical arbitrage profit. It can be the basis for pairs trading.

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