- It costs a dollar or more.
- It costs a dollar, or it costs more than a dollar.
Do they have the same meaning?
Yes, they convey the same sense. However, the former is better as the repetition of "costs" in the latter is unnecessary.
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It's not just the repeated word; the way #2 is written might be confusing to a reader. Outside of the context of explaining #1, it's not a very good way to describe the price of something. – J.R.♦ Feb 7 '16 at 19:20
Yes, they're the same.
"It costs a dollar or more" means exactly one dollar, or an amount more than one dollar. Amount ≥ $1.
"It costs more than a dollar" means amount > $1, but not equal.
Bear in mind that someone may be approximating. If you asked someone the price of a product and he said, "a dollar", I wouldn't be surprised if it was actually 99 cents or $1.05.
