As expected, the initial asking price P1 has a higher average than the price P4 at the registry office (though there is the caveat that the sample population of P1 is not exactly the same as that of P4). Thus, we face an apparent trade-off: if you want timely information then you use P1, but it has non-negligible bias.
If you want accurate information, then you use P4, but it has already become somewhat stale information by the time it is available. Best use of market information There is, however, an important way around this dilemma. It should be noted that the Handbook recommends hedonic quality adjustment in property price indexes based on detailed micro and macro market information.