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Discover Ludwig"has been flat" is correct and usable in written English.
You can use it when you want to refer to something that has not changed or moved in the past. For example: The price of oil has been flat since the beginning of the year.
Exact(60)
Since then, the market has been flat.
And, for creativity, progress has been flat.
Since 2006, though, the retirement rate has been flat.
Wall Street noticed; its stock has been flat for years.
What is more, productivity has been flat for a decade.
Household surveys show that confidence has been flat all year.
The result has been flat sales and depressed profits.
The firm's performance has been flat this year.
For example, solar activity has been flat since 1950.
British manufacturing output has been flat or falling for four months running.
It has been flat for decades, reflecting the slowing of population growth.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com