Yeah, it’s called an “overfull h-box” and occurs when TeX can’t find an acceptable way to justify the paragraph without stretching or shrinking the “glue” betwe

Yeah, it’s called an “overfull h-box” and occurs when TeX can’t find an acceptable way to justify the paragraph without stretching or shrinking the “glue” between words more than an acceptable amount. This happens more often in shorter lines, e.g. in narrow columns, because linebreaks are more frequent and there’s less glue to play with. Sometimes you can fix it by telling it how to hyphenate words it doesn’t know how to hyphenate by default. The rules are kind of complicated; one important consideration is that you need to be able to figure out how the part of the word before the hyphenation break is pronounced before reading the second part. I think “financially” could probably have been hyphenated on the first page to eliminate the overfull h-box, but it’s already part of a hyphenated word pair, so there’s probably a rule against that.