The maintenance of toilets by residents is ostensibly "negotiated and negotiated", which is fair and just, but due to the asymmetry of information between the two sides and the unequal status of negotiation, "sky-high prices" seem inevitable. Repairing the toilet is a rigid need of residents, otherwise it will affect normal life, and residents' bargaining power is weak.
In November last year, Shanghai police dismantled a fraud ring that "sold high-priced pipeline dredging agents to make huge profits in the name of dredging pipelines"