It has been a tumultuous couple of months for Alex Xu’s company – a solar panel manufacturer based in eastern China’s Zhejiang province – as product prices have surged by about 20 per cent.Long plagued by severe oversupply, China’s photovoltaic industry is grappling with cutthroat price wars and even loss-making sales. From Xu’s perspective, nearly half of the industry’s capacity is excessive.But a rebound in prices has followed recent calls from Chinese authorities to combat “involution”, or...