Quote from Don Bright:
Basic pairs trading. For example HD and LOW. Or CCL and RCL. So many pairs. You trade them based on seeing how the pair trades.
For example. If the price difference between A and B stock ranges from $1.00 to $5.00 (one being say $28, the other $29 = $1.00 up to $32 and $37 respectively, their pair range is $1.00 - $5.00). They move and down in this range, while remaining pretty safe from overall market movements, so overnights are no big risk. Market goes down 200 points, so what, they will likely move in a similar fashion.
You start selling the pair at $4.00 or so, hoping for a pull back, if it goes to $5.00, you may sell another layer. Trade in and out for about 40 cents when you can (10% of that range approx).
Pairs trading can be very lucrative for those with tight risk tolerances. The more pairs, the more flattening of the overall risk curve.
Don