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Why do bidders need more than 3 property management companies for bidding?

Bidding Law of People's Republic of China (PRC)

Chapter III Bidding

Twenty-eighth bidders shall submit their bid documents before the deadline required by the tender documents.

Transport to the bidding site. After receiving the tender documents, the tenderee shall sign and keep them, and shall not open them. There are less than three bidders.

A tenderer shall re-invite tenders in accordance with this Law.

The bidding law clearly stipulates that there should be no fewer than three bidding enterprises, so the tenderer should invite more than three property management enterprises!