The amount a landlord should be willing to pay will be higher than this amount if your rent is substantially below the market rate, and lower if it’s only a lit

The amount a landlord should be willing to pay will be higher than this amount if your rent is substantially below the market rate, and lower if it’s only a little below the market rate. ...Why? I don't see how that conclusion follows from the data. The data only compared occupied vs unoccupied rent-controlled home sale prices. Nothing took into account how under-market said rents were. Unless I missed something...