[General] Less or fewer

[jiaruchan]

Today the visitor volume store-wide at 200 thousand was fifty thousand fewer than yesterday.

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Two questions about the above line:

1----- Is 'fewer' properly used?
2----- Should we have to insert 'that of' between 'than' and 'yesterday' to make it as :
Today the visitor volume store-wide at 200 thousand was fifty thousand fewer(less) than that of yesterday.

Thank you.

 

[Raymott]

Today the visitor volume store-wide at 200 thousand was fifty thousand fewer than yesterday.

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Two questions about the above line:

1----- Is 'fewer' properly used?
'Fewer' is correct for people. But given that they are measuring people by 'volume', 'less' could be used. "There were fewer visitors today, but there was less volume"

2----- Should we have to insert 'that of' between 'than' and 'yesterday' to make it as :
Today the visitor volume store-wide at 200 thousand was fifty thousand fewer(less) than that of yesterday.
That is what is meant, but it can be ellipted out.
Thank you.

R.

https://www.usingenglish.com/forum/ask-teacher/121444-use-fewer-less.html
https://www.usingenglish.com/forum/ask-teacher/119838-fewer-less.html