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In the first sentence isn't "only" making monetary system the necessary condition and population centers with market places the sufficient condition? According to Kaplan explanations market place is the necessary condition and I am not understanding why. I am early on in my studying as I start drilling must be true questions. I haven't gotten to conditional reasoning and formal logic yet. Should I maybe go to those sections first. Thanks.

"The only" introduces the sufficient.

"Only if/ Only when/ Only where" introduces the necessary.

kevgogators wrote:"The only" introduces the sufficient.

"Only if/ Only when/ Only where" introduces the necessary.

I thought "only" was a necessary condition indicator?

"Historically, monetary systems have developed only in population centers with marketplaces."

When you use the word "only" as a necessary marker, it typically comes immediately BEFORE the necessary. You acknowledge that it's a necessary indicator, but attach it to the information that came before it, instead of the information that follows it. That's where you went wrong.

"Sarah will go to the gym only on Tuesday." This translates to "If Sarah goes to the gym --> Tuesday"

Kevgogators is right that "the only" works differently, but the sentence you are referring to is the typical usage of "only", you just connected the word "only" to the wrong part of the sentence.