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I found this sentence in a dictionary:

The tenuous link between interest rates and investment.

Why is interest rates plural here but investment not? I know investment is a countable noun, so shouldn't it be investments (or both just use singular nouns with no article, like interest rate and investment) in order to match before and after and?

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    BTW this isn't a sentence.
    – user3169
    Commented Mar 6, 2016 at 18:42

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The tenuous link between interest rates and investment

This is correct because interest rates are values that change over time. Also there are various rates for different products.

In this interpretation, investment would be an activity (like running), not a thing, so you don't make it plural.

You could say:

The tenuous link between interest rates and investments

But in this case, investments refers to those specific investment products (like a savings account and some stocks) where there can be more than one.

More context is needed to know which option is correct.

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There are several different

interest rates

and these rates are usually shown shown on a graph over different durations to create a yield curve

Without seeing more of your excerpt, my interpretation is it is either referring how interest rates effect investing in interest rates and therefore the singular, or how it effects the act of investing money: investment

investments

usually refers to the different types of things or assets to invest in

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