+0
we're learning about abstract/concrete nouns in 9th grade english. i was asked if "investment" is an abstract or concrete noun, and i feel like i'm over-analyzing it. here's the sentence it is used in: "the investment of our resources reveals the truth about our priorities." i can make it plural and say "investments", but it also seems like something i can't taste, feel, see, smell, or hear. which is it -- abstract or concrete?
+0
Don't confuse the idea of countable or uncountable with concrete or abstract.

A piece of luggage is quite concrete, but it's only "luggage." You don't have one luggage, two luggages, etc.

At the same time, a hope for world peace is one hope, and a hope for the quick discovery of a way to make cheap renewable energy is another hope, so you have two countable hopes, but it's quite abstract.

An investment straddles the definitions. If you bring a pile of cash, you can see that, but really, it's the idea of expecting more value, so I'd say it's abstract.
Comments  
"Investment" may be countable (concrete) or uncountable (abstract). The context in your sentence makes it abstract, in my opinion.

Try using the plural in a sentence.

Edit. Well, I suppose you could use the same sentence. But I believe the sense would be different.

It is a bit of a grey area in this case. The speaker would probably intend the abstract meaning.
"Priority/priorities" appears to present the same problem.
When we speak of our priorities, we may be thinking of them as "stuff."
That is, not priority #1, #2, #3.

"the investment of our resources reveals the truth about our priorities."
What would you think about changing "priorities" to singular in your sentence?
Try out our live chat room.
Anon, you are making basic errors way below the level of the question you are asking. Sentences begin with a capital letter. The word "I" is always capitalised.
 BarbaraPA's reply was promoted to an answer.
Grammar GeekDon't confuse the idea of countable or uncountable with concrete or abstract.
Great point, GG.
(You may have to remind us again.)

- A.
Students: We have free audio pronunciation exercises.