Import tariffs and other restrictions on international trade had to be sufficiently high as to protect the targeted industry, and low enough as to act as a “pressure mechanism” that forced producers to improve productivity.
What do those underlined "as"s mean?
The "as"s are unnecessary (add no meaning) and are, in my view, not really correct. Most probably the wording is modelled on the pattern "so ~ as to ~", but when the pattern is changed to use "sufficiently" or "enough", the word "as" becomes superfluous.
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The "as"s are unnecessary (add no meaning) and are, in my view, not really correct. Most probably the wording is modelled on the pattern "so ~ as to ~", but when the pattern is changed to use "sufficiently" or "enough", the word "as" becomes superfluous.