Property market collapse like bank run,

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A bank run is an event where bank customers try to withdraw more money from the bank than the bank can provide. Banks do not keep all customer deposits available in cash for immediate withdrawal. Instead, those assets are invested in loans and other types of investments. Likewise, banks only keep small amounts of cash stocked in vaults and automatic teller machines (ATMs). As a result, an overwhelming demand for deposits can leave a bank unable to give customers their money.
When a bank cannot satisfy customer demands for withdrawals—or if there’s a rumour that the bank will be unable to do so—the situation worsens. Customers fear being the “last one to the exit,” and they attempt to withdraw as much as possible. In a worst-case scenario, a bank may be unable to meet obligations, leading to complete failure.

1) Demand = Supply ----------- balance.

2) Demand > Supply ----------- moving upward.

3) Demand < Supply ----------- moving downward.

So like the bank run fear of losing money has scared the buyers and there are more sellers in the market.