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Discover LudwigThe phrase "stock index" is correct and widely used in written English.
It refers to a numerical representation of the overall performance of a group of stocks traded on a financial market. You can use it when discussing market trends and investments. Example: "The stock index showed a significant increase today, with the tech sector leading the way."
Exact(34)
Stock index futures rose overnight.
600, a small- stock index.
Shanghai's main stock index fell 0.7 percent.
His comments sent stock index futures higher.
No other international stock index comes close.
The Philadelphia Bank stock index rose 4.4percentt yesterday.
Similar(26)
500-stock index.
500-stock index on Thursday.
500-stock index each rising 3.1percentt.
500-stock index would not be shocking.
500-stock index rose 13.1percentt.
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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