The game can't count ships, so there are no limits on how many of a class can be spawned. The trick is to make it so at least too many don't show up in a given group, or ideally patrol for some. It's a fundamental flaw of the game engine that should have been addressed given attacks on capital ships (you sink Yamato, then Musashi, then the next patrol they are back again).
Not as critical for merchants since they are meant to be somewhat generic (hard to model hundreds of different merchants).
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"Government, even in its best state, is but a necessary evil; in its worst state, an intolerable one." — Thomas Paine
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