: Why are the paragraphs of a document often indented and not vertically separated? A quick side by side comparison of two layout styles: Left: no indent and with white space; right: indented,

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I guess Sander is 26 now; however I am 76. As someone suggested, I prefer indentations because that is what I have seen in all the books I have read for 65 years from children's books to murder mysteries.

When reading articles on the internet, I still read most of the articles that I see on the internet. Although occasionally I scan articles and I guess the spacing between paragraphs helps me then.

I do scan EULAs, TOSs and Privacy Policies, etc.

But if I copy an article for later reference or for my wife, I change the formatting to indentation. I did find the info here informative because it was really bugging me why the style seemed to be changing to spacing between paragraphs.

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I just pulled a random selection of books off my shelf, US and European publishers, and almost all use indented paragraphs, although I am told that this is less common in Germany. Apart from the savings mentioned above, in print it is the only clear way to distinguish a paragraph, short of using something like drop letters. Think of a sentence that ends at the end of a line and is also the last on a page. The next sentence, which is in the same paragraph, will start at the top of the next page. If you mark paragraphs simply by using extra vertical spacing, you have no way of knowing whether this sentence is the same paragraph or not. A common convention is also to not indent paragraphs that immediately follow a heading, as the heading itself is sufficient to indicate that what follows is a new paragraph. It goes without saying, I would hope, that the heading should be on the same page as the following paragraph.

Unfortunately, word processors such as Word do not automatically recognise the first paragraph after a heading as in any way special, and most people are ignorant of basic conventions and word processor styles. You need to use specialist type-setting tools, such as TeX, to get the effect needed, or be prepared to fine tune after all writing is finished (which you should do anyway, but few bother).

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It's not related to academic vs non-academic styles, but a mere matter of proper typography and cost-effectiveness.
Butterick's Practical Typography offers the generally accepted rule:

A first-line in­dent is the most com­mon way to sig­nal the start of a new para­graph. The other com­mon way is with space be­tween para­graphs.
First-line in­dents and space between paragraphs have the same re­la­tion­ship as belts and sus­penders. You only need one to get the job done. Us­ing both is a mis­take. If you use a first-line in­dent on a para­graph, don’t use space be­tween. And vice versa.

As to cost-effectiveness, space between paragraphs is most common on the web because it's the easy to do using CSS. First-line indent is most common in print because you save paper. Books and journals get printed; that's probably all there is to it IMHO.

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Indented paragraphs with no space between them are the easiest to read. Unindented paragraphs with space between them are the easiest to create, especially in legacy Web publishing. Neither style is “correct.” There are no rules in English, only conventions. Both of these styles of paragraph are conventional. Personally, I think readability should be prioritized, and prefer to publish indented paragraphs with little or no space between them.

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I've never heard this style called "academic". I don't know if you just made that phrase up or you heard it somewhere.

But since I was a wee lad in school 40 years ago, I've always been taught that there were two styles for writing a paragraph: "block style", where you put a blank line between paragraphs, and "indent style", where you indent the first line of each paragraph.

Which is better is pretty much a matter of taste. Indent style takes a little less room as it doesn't have all the blank lines, which is good if you want to make what you've written look shorter and bad if you want to make it look longer. I suppose one could argue that indent style eliminates an ambiguity when a paragraph happens to begin on a new a page. Is that a continuation of the paragraph from the preceding page or a new paragraph?

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Print versus web.
By far the majority of print books format paragraphs by indenting, and not by inserting space between paragraphs.

The other style, with inter-paragraph spacing and no indentation, seems like a far more recent style to me, achieving popularity with the rise of the Worldwide Web.

Most of the ebooks I buy (and I buy a lot) use indentation for paragraphing. A few use inter-paragraph spacing. A few of the non-indented ones somehow lose their inter-paragraph spacing in some e-readers, which makes it very difficult to read.

Readability.
A friend recently published a book with inter-paragraph spacing, no indents, and sans-serif font. I find the thing unreadable. Perhaps much of "readability" is in what style we are used to.

For example, I had long accepted the idea that sans serif fonts are less legible than serif fonts for print. But (if I understand correctly), research does not support that conclusion. At least, not clearly.

It would be interesting to read controlled studies of these two paragraphing styles.

Printing costs.
Your example demonstrates one reason not to format paragraphs by indenting instead of inter-paragraph spacing: You can fit more words on a page. The example on the right has 26 lines, compared to 24 on the left. I haven't counted the words, but indenting that text instead of spacing between paragraphs allows 8 percent more words per page.

And those are big, blocky paragraphs. A passage with shorter paragraphs would gain even more from indenting instead of adding space.

More words per page means fewer pages per book, which saves maybe 10-20 percent of printing costs.

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Up until recently the "correct" way to indicate the start of a new paragraph. It is what was taught at schools and preached by style guides. Esentially it is the default because it has been the default for a long time.

Now, either tend to be considered acceptable (although some insitutions or organisation may prefer a particular style) but indents are probably more popular.

Readability might have more to do with what you're used to and, to some extent the medium you're reading (electronic or print) and even the nature of the text.

I, for example, don't like whitespace in finction as I find it jarring and clinical and it brings me out of the story. But I grew up with indents as standard, so it might be that.

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