Is it correct sentence?

[kks_krishna]

See the following sentence,

How Dollar value depreciation would affect economy?

Is the sentence is correct? How I can change this to make ti better?

[Bennevis]

How would (the) dollar depreciation affect the economy?
How will (the) dollar depreciation affect the economy?

[kks_krishna]

Thank you!!!

[kks_krishna]

what is the correct way of using "the" word?

[Bennevis]

what is the correct way of using "the" word?

If you mean "this" (current) dollar depreciation, "the" will be used. Otherwise, no article or "a" (if you mean it at some point in time). That's the way I see it.