This fallacy is committed when an argument assumes the truth of its conclusion. It is clear, and therefore not terribly deceptive, when this fallacy is committed in an argument in which the conclusion simply restates a premise of the argument in the same terms. Arms races inevitably lead to war. On the other hand, when in an argument the conclusion restates a premise in different terms, the fallacy can be deceptive. The existence of unions has a deteriorating influence on the nation's commerce and business.
Unions have a detrimental effect on the national economy.
Curiously, these arguments are deductively valid. If a premise and the conclusion of the argument have the same meaning, then if the premises of the argument are true, the conclusion must be true. An argument that begs the question simply says the same thing twice, and whether we state a certain claim twice or three hundred times, the repetition alone provides no reason to believe that the claim is true.