Here are two trivial but powerful facts: - if you first gain 20% and then lose 20%, you're worse off than when you started. - if you first lose 20% and then g

Here are two trivial but powerful facts: - if you first gain 20% and then lose 20%, you're worse off than when you started. - if you first lose 20% and then gain 20%, you're also worse off than when you started.