9.54.3 Can you answer these questions?

9.54.3.1 How dominant is LaTeX in academics & publishing?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=693440

Are there any public stats that demonstrate how much literature is produced in LaTeX as opposed to Microsoft Word, Adobe InDesign, etc? When I search "latex market share" every single result ... 
[msword] [journal-publishing] [adobe] [publishing]
 

asked by zec47152 https://tex.stackexchange.com/landing/r/digest?cta=user&id=302401 Score of 1

9.54.3.2 Custom line breaks in maketitle with authblk

https://tex.stackexchange.com/landing/r/digest?cta=question&id=693180

I am trying to modify the output of the affiliations defined with authblk to print each entry on consecutive lines, and when the text width is exceeded break the line at the symbol separating the ... 
[line-breaking] [titles] [authblk]
 

asked by Brendan Kochunas https://tex.stackexchange.com/landing/r/digest?cta=user&id=302205 Score of 1

9.54.3.3 Page size and bold type

https://tex.stackexchange.com/landing/r/digest?cta=question&id=693214

How can I make a latex document where the page is 13cm wide and 21cm long ? I also want to use bold type.  Is there a limit on how large the font can be ? 
This is what I got 
\documentclass[a4paper,... 
[page]
 

asked by Agava https://tex.stackexchange.com/landing/r/digest?cta=user&id=302229 Score of 1