Billionaires 7 years ago:
https://web.archive.org/web/20171004002738/https://www.bloomberg.com/billionaires/
Billionaires today:
Billionaires 7 years ago:
https://web.archive.org/web/20171004002738/https://www.bloomberg.com/billionaires/
Billionaires today:
You’ve convinced me.
https://en.wikipedia.org/wiki/Compound_(linguistics)
https://www.merriam-webster.com/grammar/spelling-using-compound-words-guide
Corrected