longley doesn't print

when i run ''longley'' doesn't work, but when i run ''plot(longley)'' or ''longley$Unemployed'' it's show some data, i need help, please.
same occasion occurs at head(x=iris) or similar commands, doesn't print but in the system have the data.

Is it because it is running in the RMarkdown document but not showing in the console?

Also, provide code, not screenshots of your code.

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