ARV and MARKET VALUE

I just want to confirm if my understanding between ARV and Market value if correct.

We get the Market Value based on the comps of the same/exact property within 1/4 mile radius and sold within 3 months.

How about the ARV? How much value do we add to the market value to get the ARV? For the cash investors who is saying 70 cents on a dollar, is it 70 cents of the market value or 70 cents of the ARV?

appreciate any opinion/information. thanks!

arv is the market value of properties that have been fixed up, so when looking at comps you want retail sales (someone is buying and moving into the house) vs. wholesale or purchase at sheriff sale