A major Bluetooth headphone maker, Dongguan Koppo Electronics Co, has decided to shut down for good and dismiss all its workers, becoming the latest casualty of the economic headwinds, supply chain disruptions and trading woes that have hit China’s manufacturing heartland. Koppo Electronics, which has operated its factory in the city of Dongguan in southern Guangdong province for 12 years, said it was ceasing operations partly because “a number of cross-border e-commerce clients have failed to make due payments”, according to a notice seen by the Post . “Since the outbreak of the Covid-19 pandemic, global economic and trade flows…