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At the same time, negative effects, like serious oversupply of PV industry, were brought about by these large scale governmental subsidies. Although governmental subsidy strongly supports the China PV companies, few of them have competitiveness in the global market.

The review of policy incentives from different counties shows that FiT, rebate policies, and special PV programs (California Solar Initiative) exert significant positive in PV promotion. In contrast, an upfront subsidy may be more effective than a post-subsidy.

Although governmental subsidy strongly supports the China PV companies, few of them have competitiveness in the global market. This dramatically conflictive phenomenon attracted many researchers' attentions in recent years.

The reduction in subsidies could place additional strain on China's solar industry, which is already grappling with overcapacity and plummeting panel prices that threaten the viability of smaller manufacturers.

Providing a systematic review on residential solar PV adoption by a new structure. Both the technical and economic potential of residential PV is substantial. High upfront costs, lack of recognition, and product problems are key barriers. Subsidies, peer effects, and business innovations are important in PV adoption.

Enterprise development stages were determined based on net revenue. Subsidy effects on PV companies at different developing stages were studied. The occasion to provide subsidy at different developing stages was investigated. Z-score formula method was used to find the best exit occasion of subsidy.