Let x be the difference between actual and estimated revenue. What is the corresponding sample space?

Consider an experiment that records the error (difference) between the actual and estimated revenue of a corporation.
Let x be the difference between actual and estimated revenue.

What is the corresponding sample space?
Update: so upon checking the correct answer with the key, it is: 𝑆 = 𝑅 = {π‘₯| βˆ’ ∞ < π‘₯ < ∞}.
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