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When you subtract a negative number from a positive number, it is equivalent to adding the two numbers together. Therefore, it is a gain.
Certainly, if some of the data is negative
We have negative numbers, because if there were no negative numbers, people wouldn't lose profit, they would always gain.
it is negative infinity minus one
The data from a normal distribution are symmetric about its mean, not about zero. There is, therefore nothing strange about all the values being negative.