Yes. There is a system called MLS which is a central listing service used by all real estate agents. https://www.nar.realtor/nar-doj-settlement/multiple-listing-service-mls-what-is-it#:~:text=An%20MLS%20is%20a%20private,to%20other%20real%20estate%20brokers.&text=The%20MLS%20is%20a%20tool,help%20sell%20their%20clients'%20homes.
MLS access isn’t guaranteed and there are FSBO and pocket listings
TIL
Depends on Market. I.e. Terre Haute, IN only ava on Zillow and not Redfin. Not all companies share same MLS access.
Nope. The good ones aren't on the mls
This
Tons of off market inventory that is traded without ever making it on the MLS
no. look up “pocket listing”
No
The best deals never make it to the market
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Completely depends on the area, but these sites should have 90-95% of listings. Not all though and perhaps more importantly, not instantly.
As a follow up, that doesn’t mean any single agent will have 100%