The first one easily generates examples: for all people X, X's monopoly on the labor of X. My monopoly on my labor. PepeGomez's monopoly on PepeGomez's labor.

The second one would be artistic works like books, drawings, movies, etc. Would also include inventions. In that case, it's a lot more likely that someone later on would come up with the same invention, which is why limits on monopoly length are reasonable; as time goes by, it becomes less true that "If not for this monopolist, we would not know of this pattern."

But what do you mean by "your labor"? How could you not have a monopoly on your labor?

>Would also include inventions.

Inventions don't exist because of a single person. In most cases there is only one or a few workable solutions. Most patentable things are invented multiple times.